单项选择题

How she wishes she（）more attention to her lessons when she was at school!

A. have paid
B. paid
C. had paid
D. has paid

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单项选择题

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

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

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

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