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
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单项选择题
More than one teacher ______ told him it is important that he learn English well if he ______ abroad.
A．had; will go
B．has; wants to go
C．has; want to go
D．have; shall go
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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