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. did
C. would
D. was

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After()seemed an endless wait, it was her turn to enter the personnel manager's office.

A. that
B. there
C. what
D. it
单项选择题
Had he worked harder, he()the exams.

A. must have got through
B. would have got through
C. would get through
D. could get through
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