17. ______is known to all that Taiwan is a part of China.
A. It
B. This
C. That
D. Which
答:A。it为形式主语,真正的主语为that从句。
18. The baby sat on________mother’s knees, learning to speak.
A. it
B. it’s
C. its
D. /
答:C。it可指代婴儿。
19. We took ______for granted that he would join us.
A. this
B. that
C. it
D. them
答:C。it为形式宾语,真正宾语为that从句。
20. ________is forbidden to smoke in the concert hall.
A. Here
B. It
C. That
D. This
答:B。it做形式主语,不定式为真正主语。
21. ______no need for us to discuss the problem again since it has already been set-tied.
A. It has
B. There has
C. It is
D. There is
答:D。no need为名词做主语。或用It is not necessary...。
22. Was it in 1969 ________ the American astronaut succeeded ________ landing on the moon?
A. when, on
B. that, on
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