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。不能選B，因為該句中被強調的部分是時間狀語從句。

　　92. 答案是B，其中that也可換成which。又如：

　　It is the sun that / which gives us light and heat. 是太陽給了我們光和熱。

　　93. 答案是A。句中的引導詞that可換用who。有時強調句以倒裝(疑問句)形式出現(xiàn)，此時可用“還原法”加以辨別。必須注意的是，當被強調的是主語時，代詞要用主格形式。例如：

　　It was I who discovered the secret first. 是我最先發(fā)現(xiàn)這個秘密的。

　　94. 答案是B。注意習慣上不用not till，而且從句不能用when引導。

　　95. 答案是D。這句是強調句，因為被強調的部分in 1969是that從句中一個完整的句子成分，改為非強調句后的句子

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

　　96. 答案是A。本句的December 26, 1893不能成為從句的一個完整成分，所以不是強調句，而是定語從句，December 26, 1893是先行詞。在強調句中，it是先行詞;在第二句中，it作主語，指時間。

　　97. 答案是B。由于所敘述的是過去的事，不能用is。

　　98. 答案：B

　　解析：此題容易誤選D，認為強調的是原因狀語從句 because we were late。但實際上，此題的答案為B，強調的是句子主語 our being late，此題若還原成非強調句，即為：Our being late caused him to serve dinner an hour later than usual.注意，強調句的一個顯著特點是，若去掉強調結構 it is [was]… that…，句子仍然成立;換句話說，該結構中的 that 不能充當句子成分。

　　99. 答案：A

　　解析：幾個干擾項均可能誤選。答案選A，為強調句的特殊疑問句形式，其相應的陳述句形式為：

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

　　100. 答案：C

　　解析：被強調成分為 who，該句實為類似 It was Tom that saved the drowning girl. 這類強調句的特殊疑問句形式(即對其中的Tom 提問而得)。