单项选择题

(By the time) Neil Armstrong and Edwin Aldrin, Jr. walked on the Moon (in July 1969), there (will have) been many (space) expeditions.

A. By the time
B. in July 1969
C. will have
D. space
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单项选择题
Americans use their cars for nearly 90 per cent of all personal ().

A. trips
B. travels
C. voyage
D. journey
单项选择题
I wish I () yesterday, instead of staying at home.

A. came
B. come
C. should come
D. had come
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