单项选择题
Five minutes earlier, ______we could have caught the last train.
A．and
B．but
C．or
D．so
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单项选择题
I am feeling sick. I ______so much chocolate.
A．needn’t have eaten
B．couldn’t have eaten
C．mustn’t have eaten
D．shouldn’t have eaten
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单项选择题
Had he worked harder, be ______the exams.
A．must have got through
B．would have got through
C．would get through
D．could get through
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