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
James has just arrived, but I didn't know he ______ until yesterday.
A．will come
B．was coming
C．had been coming
D．came
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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