单项选择题

It's time ______ about the traffic problem downtown.

A. something was done
B. anything will be done
C. everything is done
D. nothing to be done
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单项选择题
______ at the station, John found the train had just left.
A. On reaching
B. On arrival
C. At reaching
D. At arrival
单项选择题
The streets were deserted the policeman on duty.()

A.except
B.except for
C.but
D.besides
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