单项选择题

He ______ another career but, at the time, he didn't have enough money to attend graduate school.

A. might have chosen

B. might choose
C. had to choose

D. must have chosen
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单项选择题
5 America will never again have as a nation the spirit of adventure as it ______ before the west was settled.
A. had
B. did

C. was

D. would
单项选择题
Alec's keen eyes will not overlook ______ the letter in the wrong place, yet he purposely keep silent for politeness.
A. you placing B. you to place
C. your to place
D. you have placed
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