菜鸟给高分求选择题答案，望解答的人给出每道选择的原因。

16.Students can be hard ___ themselves in judging such behavior. A by B for C at D on 选B.be hard for 为固定搭配。
17. The teacher asked the children to ___ a story about a trip to the moon.A make up B make out C turn up D turn out
A.make up 编造The whole story is made up.
B make out 辨别出 I could hardly make out anything in the thick fog.在浓雾中我几乎什么也看不见。
C turn up 出现;发生 Something unexpected has turned up. 发生了没有意料到的事情。
D turn out 结果是;证明是The party turned out to be very successful. 晚会结果开得很成功。
所以选择A老师让孩子们去编一个去月亮上旅行的故事。
18. Do you think the tall buildings in Shenzhen are ___ in appearance to the skyscrapers in Manhattan, New York？A.familiar Bsimilar C likely Dalike 选择B.similar你认为深圳的高层建筑和纽约的有相似之处吗？
19. I received your message yesterday and have passed it ___ to all the people concerned.A by B on C over D down
A.pass by 经过;过去 A bus has just passed by. 一辆公共汽车刚刚过去。
B.pass on 传递 Would you pass it on to the next person? 把它传给下一个人好吗?
C.pass over 忽略 How could you pass over such an important matter? 你怎么能忽略如此重要的事情?
D.pass down 传下来 The tradition has been passed down for hundreds of years. 这一传统已传了几百年。
所以，这个题应该选B 昨天我收到你的信息，并且把它传递给了其他相关的人。
20. All was darkness ___ an occasional glimmer in the distance. A despite B instead of C except for D besides
所有的地方都是黑暗的，没有一丝光亮
A.despite He went to work despite his illness. 尽管生病,他还是去工作。
B.instead of He will go instead of you. 他将代你去。
C.except for The composition is quite good except for the spelling. 这篇文章除了拼写以外,其他都不错。
D.besides What has he done, besides reading the paper? 除了看报,他还做了什么?
这道题我认为应选择 C.except for
21. Many years ago, Chinese workers were made ___ from morning till night. A work B to be worked C worked D to work
许多年过去了，中国工人被要求从早晨工作到晚上。
选B因为中国工人是被要求的
22. It was impolite of him to leave without ___ goodbye. A saying B said C say Dsays
不说再见就离开对他是不礼貌的
选A，因为without是介词，动词介词之后要用ing形式。
23. Oh! Look, it’s already 8 o’clock! It’s high time we ___ to school. A go B would go C went D are going
现在是8点了，该去学校了！
选D,it's high time是“该干什么的时候了”，的意思。其后应该使用ing形式，it's high time doing sth.
24. Before we let him go , we asked him to promise ___ anyone what we had said to him.A to tell not B not to tell C to not tell D not tell to
在我们让他走之前，我们要求他承诺不要将我们给他说的话告诉其他人。
promise He promised to help us. 应要帮助我们。
选B，promise 否定式：promise not to do
25. They ___ out because the light is on. A can’t have gone B do not go C didn’t go D haven’t gone
他们不可能出去，因为灯还亮着。
表示对过去的推测，应该使用虚拟语气。选A.can't have gone.
情态动词 + have + 过去分词 都是表示对过去的推测，除了本题中的情况，还有其他的情况详见：http://zhidao.baidu.com/question/36642694.html
26. It is ture that ___ you get into the habit of smoking, you’ll find it extremely difficult to get out of it . A though B as C once D while
如果你一旦养成了吸烟的习惯，你会发现戒烟将是非常困难的。
选择C,once有一旦的意思
27. No matter ___ your opinions are , you are welcome to join in our discussion.A which B how C what D when
无论你的观点是什么，都欢迎你加入我们的讨论
选择C,从句缺少宾语。
28. I had my meals ___ to me when I was ill in bed with a bad cold . A brought B to be brought C bringing D to bring
当我感冒生病在床上的时候，我已经请人帮我买饭了。
have sth done 要求某人做某事
所以，这个题选择A
29. It didn’t seem likely ___ they would ever keep their promise. A for B that C when D how
看起来他们不会遵守诺言。
这里考察的强调句型，it is ...that...结构
所以，这个题选择B
30. My watch is nowhere to be found, I ___ when I was on the bus. A must drop it B should have dropped it C ought have dropped it D must have dropped it
和上面的25题一样，考察的是虚拟语气，表示对过去的推测。
我的手表找不到了，一定是在公车上丢掉了。表示对过去肯定的推测。所以，此题应选择D。

哇，加油哦！我英语2年都忘得差不多了，假如你是考四六级的话就多读点找点语感，其实一般题目都没有什么原因的，读到就觉得是那个了。四六级基本不考语法的，就是靠单词。