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
He was in poor health. He could not make his voice（）

A. hear
B. to hear
C. heard
D. to be heard
单项选择题
Half a year after the war, schools in the country returned to（）

A. normal
B. cultivation
C. instruction
D. education
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