单项选择题

The children were surprised when the teacher had them ______ their books unexpectedly.

A．closed
B．to close
C．closing
D．close
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单项选择题
The streets were deserted the policeman on duty.()

A.except
B.except for
C.but
D.besides
单项选择题
The problem ______ at the meeting next week is of great importance.
A．discussed
B．to be discussed
C．being discussed
D．discussing
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