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
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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
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
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