单项选择题

Because of the unexpected changes, they postponed ______us an answer.

A．giving
B．have given
C．to give
D．to have given
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单项选择题
The White House and other federal buildings were ______ as a plane enters the restricted airspace.
A．vacated
B．empty
C．deserted
D．evacuated
单项选择题
A．have writtenB．to be writtenC．are writtenD．write
A．have written
B．to be written
C．are written
D．write
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