几道高中英语单选题，详解。

1.你知道，下句是陈述句，是上句的答句。其实省略了“He wanted to know ”。完整句子为"He wanted to know when it was that I could finish writing the report".，你看看，是不是这样的？那就是D了。
2.for__ life was hard in the past是修饰scientist的，是吧？
如果按照你的想法，就是“scientist,for whose life was hard in the past”。
但是你看，在for whose life was hard in the past句子里面，for whose life是不是某种程度上，有点状语从句的作用？既然是状语从句，那把他拿掉，剩下was hard in the past，是不是里面缺少了主语了？就算读起来是不是也很别扭？不管是语法还是语感上说，是不是该加上it？按照你原来的理解的话，完整的整个句子应该是It is known to us all that the old scientist,for whose life it was hard in the past,still works hard in his eighties.

1. （It was） when （ that ） I could finish writing the report.
小括号表示的是“强调的语法结构”。强调句的特点是，如果把小括号全都去掉，句子结构仍然完整。

2.It is known to us all that the old scientist, [（for whom ) life was hard in the past ],still works hard in his eighties.
中括号是个定语从句，先行词是the old scientist，连词whom = the old scientist。主语是life。这个定语从句可以解释为： [（for the old scientist) life was hard in the past].
如果选whose，那么whose = the old scientist‘s。那么：[ for ( the old scientist‘s life ) was hard in the past）。这样the old scientist‘s life就是主语了。for这个介词就无法交代了。

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1.-What did he want to know?
-__ I could finish writing the report.
Awhen was it BIt was when that CIt was when DWhen it was that
答案 DWhen it was that 完整句子为"He wanted to know when it was that I could finish writing the report".
强调句型：
I met him in the street yesterday.
这个句子你可以强调主语，宾语，地点状语，时间状语：
It was I that met him in the street yesterday. 就是我昨天在街上遇到他。（强调是我而不是别人）
It was him that i met in the street yesterday. 我昨天在街上遇到的就是他。（强调是他而不是别人）
It was in the street that I met him yesterday. 就在街上我昨天遇到了他。（强调在街上而不是其它地方）
It was yesterday that I met him in the street. 就在昨天我在街上遇到了他。（强调是昨天而不是其它时间）
2.It is known to us all that the old scientist,for__ life was hard in the past,still works hard in his eighties.
答案whom，因为the old scientist为定语从句先行词，定语从句中whom做for的宾语，life是主语，was是系动词，hard为表语in the past是状语