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
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A. could
B. was
C. would
D. did
单项选择题
It was a bold idea to build a power station in the deep valley, but it ______ as well as we had hoped.
A. came off
B. went off
C. brought out
D. make out
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