单项选择题

We had difficulties at first but everything worked ______ smoothly in the end.

A．off
B．out
C．away
D．up
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单项选择题
The children went there to watch the iron tower ______.
A．to erect
B．be erected
C．erecting
D．being erected
单项选择题
The decline of Rome ______ the disappearance of classical drama.
A．restrained
B．withheld
C．restored
D．witnessed
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