单项选择题

He kept his head at that critical moment; otherwise the accident ______.

A. would happen
B. happened
C. would have been happened D. would have happened
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单项选择题
Mike looks so sleepy in the class; he ______ up last night.
A. must stay
B. should have stayedC. must have stayed D. is sure to stay
单项选择题
They stood still on the top of a mound, gazing out over the endless______of the grassland.
A. space
B. expanse
C. stretch
D. land
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