推荐回答（5个）
答案为B，因为thief 如果被注意到了，用法应该是the thief was noticed。用否定，表示一种进入房间的方式，用without being noticed是很容易理解的。
C项 having noticed 不是被动，是have noticed的变形而已，是主动的形式。
D项，是被动形式，但是没有涉及到先后，就是enter和 be noticed 没有涉及先后顺序，be noticed更多表示伴随enter或者是enter的方式。
希望对你有用。
答案B being noticed 这是动名词的被动形式 作介词宾语
选项C having noticed 是动名词的完成形式 不是被动 所以不选
如果 选C的话 having noticed后缺宾语
选D 虽然是 被动形式 但有逻辑错误 因为该形式表示动作发生在 谓语动词之前
答案C并不是被动
被动是be + done
have + done 是主动
答案D是被动 是现在完成被动式
但是根据题意 没有必要用现在完成时
所以答案只能是B
下列每组对话中都有一个错误，找出来并改正
They are my family.let me to introduce them to you. ( let me introduce ......)
Can you go to hospital with your little sister?
Of couse,I can. ( Can you go to the hospital......)
3. No,it isn't her. (No,it isn't.)
将下列句子改写为Let引导的祈使句
Let my sister send me one peach
Let me pass your bag to Lily
Let her put the pyjamas in the washing machine.
选择适当的句子补充对话
Look at this note.（1）_____C____.（←填上适当的序号）
（2）_______________E___________________.
Perhaps,it is your father's. (3)________A______________.
Where do you find it? (4)__________B__________. (5)________D________.
Yes,you are right.
你的答案是对的。
主动和被动的区别。 小偷是没有被发现(being noticed)，而不是发现了别人(having noticed)。
c. having noticed
have + v.过去时 = 过去完成时, 不是被动语态
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