单项选择题

Unless()by credit card, please pay in cash.

A. pay

B. is paid
C. paying
D. paid

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单项选择题

It is only when you nearly lose someone()fully conscious of how much you value him.

A. do you become
B. then you become
C. that you become
D. have you become

单项选择题

I hope all the precautions against air pollution,()suggested by the local government, will be seriously considered here.

A. while
B. since
C. that
D. as

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