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
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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
单项选择题
It is not so much the language ______ the cultural background that makes the book difficult to understand.
A. but
B. nor
C. as
D. like
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