91. It was not until 1920 ____ regular radio broadcasts began.

A. while B. which C. that D. since

92. It is the ability to do the job ____ matters not where you come from or what you are.

A. one B. that C. what D. it

93. Was ____ that I saw last night at the concert?

A. it you B. not you C. you D. that yourself

94. It was not ____ she took off her dark glasses ____ I realized she was a famous film star.

A. when; that B. until; that C. until; when D. when; then

95. Was it in 1969 ____ the American astronaut succeeded ____ landing on the moon?

A. when; on B. that; on C. when; in D. that; in

96. It was December26, 1893 ____ Mao Zedong was born in the common village.

A. when B. that C. which D. in which

97. It ____ Madame Curie and his husband Pierre who discovered radium.

A. is B. was C. are D. were

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

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

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

99. “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

100. Who was it _____ saved the drowning girl?

A. since B. as C. that D. he

　　答案

91. 答案是C。不能选B，因为该句中被强调的部分是时间状语从句。

92. 答案是B，其中that也可换成which。又如：

It is the sun that / which gives us light and heat. 是太阳给了我们光和热。

93. 答案是A。句中的引导词that可换用who。有时强调句以倒装(疑问句)形式出现，此时可用“还原法”加以辨别。必须注意的是，当被强调的是主语时，代词要用主格形式。例如：

It was I who discovered the secret first. 是我最先发现这个秘密的。

94. 答案是B。注意习惯上不用not till，而且从句不能用when引导。

95. 答案是D。这句是强调句，因为被强调的部分in 1969是that从句中一个完整的句子成分，改为非强调句后的句子

是：The American astronaut succeeded in landing on the moon in 1969。

96. 答案是A。本句的December 26, 1893不能成为从句的一个完整成分，所以不是强调句，而是定语从句，December 26, 1893是先行词。在强调句中，it是先行词;在第二句中，it作主语，指时间。

97. 答案是B。由于所叙述的是过去的事，不能用is。

98. 答案：B

解析：此题容易误选D，认为强调的是原因状语从句 because we were late。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。

99. 答案：A

解析：几个干扰项均可能误选。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.

100. 答案：C

解析：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)。