单项选择题

I（）the train but I overslept that morning.

A. could catch
B. might catch
C. must have caught
D. could have caught

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单项选择题
We hope the measures to control prices,（）are taken by the government, will succeed.

A. when
B. as
C. since
D. after
单项选择题
（）he was seriously ill, I wouldn't have told him the truth.

A. If I knew
B. If I know
C. Had I known
D. Did I know
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