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
______ for you help, we' d never have been able to get over the difficulties.
A．Had it not been
B．If it were not
C．Had it not
D．If we had not been
单项选择题
I've never been to Lansa, but that's the city______.
A．I' d most like to visit
B．that I like to visit mostly
C．where I like to visit
D．I' d like much to visit
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