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
If Delia （） so much work to do, she would have taken her friend out to dinner.

A. should not have
B. had not had
C. would not have
D. would not have had
单项选择题
We didn’t know his telephone number, otherwise we （） him.

A. had telephoned
B. must have telephoned
C. would telephone
D. would have telephoned
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