单项选择题

They are so alike that you can not tell ______ is which.

A. what
B. that
C. which
D. how
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Some customers had complains ______ the food in the restaurant.
A. for
B. with
C. about
D. at
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He will come back ______ a minute.
A. for
B. on
C. at
D. in
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