1. ____ that caused him to serve dinner an hour later than usual.

　　A. It was we being late B. It was our being late

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　　C. It was we were too late D. It was because we were late

　　【陷阱】此题容易误选D，认为强调的是原因状语从句 because we were late.

　　【分析】但实际上，此题的答案为B，强调的是句子主语 our being late，此题若还原成非强调句，即为：

　　Our being late caused him to serve dinner an hour later than usual.

　　注意，强调句的一个显著特点是，若去掉强调结构 it is [was]… that…，句子仍然成立;换句话说，该结构中的 that 不能充当句子成分。

　　2. "How was ______ they discovered the entrance to the underground palace?" "Totally by chance."

　　A. it that B. he that

　　C. it when D. he which

　　【陷阱】几个干扰项均可能误选。

　　【分析】答案选A，为强调句的特殊疑问句形式，其相应的陈述句形式为：

　　It was totally by chance that they discovered the entrance to the underground palace.

　　比较以下各题，它们也属强调句的特殊疑问句形式：

　　(1) Who was it _____ saved the drowning girl?

　　A. since B. as C. that D. he

　　答案选C，被强调成分为 who，该句实为类似 It was Tom that saved the drowning girl. 这类强调句的特殊疑问句形式(即对其中的Tom 提问而得)。

　　(2) What is it _____ his daughter needs most?

　　A. what B. which C. that D. if

　　答案选C，被强调成分为 what，该句实为类似 It is a bike that his daughter needs most. 这类强调句的特殊疑问句形式(即对其中的a bike 提问而得)。

　　3. _____ was very ______ that little Jim wrote the letter.

　　A. It, careful B. It, carefully

　　C. He, careful D. He, carefully

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