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
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
单项选择题
He was in poor health. He could not make his voice（）

A. hear
B. to hear
C. heard
D. to be heard
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