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
There are nations whose lack of contact with the outside world has______ poverty.
A．fallen into
B．consisted in
C．resulted in
D．come up to
单项选择题
The pressure ______causes Americans to be energetic, but it also puts them under a constant emotional strain.
A．to compete
B．competing
C．to be competed
D．having competed
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