单项选择题

It was not ______midnight that they discovered the children were not in their bed

A．before
B．at
C．after
D．until
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单项选择题
The forest fire caused by the volcano is difficult to be______.
A．put off
B．put away
C．put out
D．put up
单项选择题
We shall ask for samples ______and then we can make our decision.
A．to be sent
B．being sent
C．to sent
D．to have been
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