单项选择题

This dictionary will prove（）to you in your English study.

A. being of some use
B. be of some use
C. to be of some use
D. of some use

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单项选择题
All the creatures depend on the sun's rays for the light and warmth which（）us alive.

A. keeps
B. keep
C. kept
D. is keeping
单项选择题
The output of our factory is now twice（）it was three years ago.

A. what
B. that
C. as
D. which
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