单项选择题

Quitting can be productive sometimes,______you know when to do it.

A. so long as
B. so that-
C. unless
D. now that

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单项选择题

The policeman was in plain clothes, watching for a______character at the airport all night.

A. suspicious
B. suspect
C. susceptible
D. doubtful

单项选择题

I'm in a hurry, and I'll see you______time.

A. the other
B. in another
C. other
D. some other

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