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
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单项选择题
______ is known to the world, Mark Twain is a great American writer.
A．That
B．Which
C．As
D．It
单项选择题
Jean didn't have time to go to the concert last night because she was busy ______ for her examination.
A．to prepare
B．to be prepared
C．preparing
D．being prepared
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