单项选择题

The officer allowed no soldiers to ______ any excuse for not carrying out his orders.

A．think up
B．think of
C．think over
D．think about
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单项选择题
______ during the war, the airport has never been used again.
A．Has damaged
B．Having damaged
C．Has been damaged
D．Having been damaged
单项选择题
______ an answer, he decided to write another letter to them.
A．Receiving
B．Not being received
C．Having not received
D．Not having received
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