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
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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
单项选择题
Two scores more, ______ we could have won the last game.
A. but
B. so

C. and

D. or
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