A. which B. whom C. that D. what
解答：选（C），本句中“that”引导的是同位语从句，that只起连接作用，在从句中不做成分。同位语从句的先行词通常为fact，information，news，message等。如：The advice that I want to give you is you should stay here.我的建议是你应该呆在这里。
51. I haven’t met him ______ the last committee meeting.
A .for B. since C. at D. before
解答：选（Ｂ）since引导的时间状语从句表示“自从（以来）”，“从……起（一直存在的某种情况）”。带有这种状语的句子谓语多用完成时态。如：I haven’t been home since 1997. For引导时间状语，通常表示一段时间；ａｔ后面接时间点；before意为“在……之前”
52. Not until quite recently ______ any idea of what a guided rocket is like.
A. did I have B. do I have C. should I have D. would I have
解答：选（A）“not until”意为“直到……才”。置于句首进行强调时，主句应发生部分倒装。再根据“recently”来判断，动词应该用过去时，所以选A。此句的强调句型也可以变成另一种形式：It was not until quite recently that I had any idea of what a guided rocket is like.
53. ______ breaks the law will be punished sooner or later.
A. Who B. Someone C. An
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