单项选择题

—My God ! I have to walk home now, for I just missed the bus.
—That’s too bad. You () it had you set out a bit earlier.

A．should have caught
B．had caught
C．would have caught
D．could catch

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单项选择题
I didn’t manage to work out the problem () the teacher had explained how.

A．until
B．unless
C．when
D．before
单项选择题
—Where’s John, do you know—Oh, () to hospital.

A．he’s taken
B．he’ll be taken
C．he’s been taken
D．he’ll take
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