单项选择题

Buses ______ very crowded, we had to go to the school by taxi.

A. having been
B. are
C. being
D. were
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单项选择题
It's difficult to ______ with the knowledge that he is a failure.
A. feed
B. live
C. stay
D. get on
单项选择题
The criminal always paid ______ cash so the police could not track him down.
A. on
B. by

C. for

D. in
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