单项选择题

Hadn't the bus broken down, we ______ the train.

A．catch
B．had caught
C．could catch
D．should have caught
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单项选择题
Please listen carefully while others ______.
A．speak
B．speaking
C．spoken
D．spoke
单项选择题
Many a way ______ tried already.
A．has been
B．are
C．being
D．have
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