单项选择题

I'll write a letter to（）people are on the list.

A. any
B. all
C. whoever
D. whichever

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单项选择题

Since the middle of this century（）has been learned about space than in all human history before that time.

A. much
B. more
C. better
D. a lot

单项选择题

There is not much（）left for those books on the shelf. Better clear some away.

A. place
B. area
C. space
D. room

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