单项选择题

Please listen carefully while others（）

A．speak
B．speaking
C．spoken
D．spoke

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单项选择题

Many a way（）tried already.

A．has been
B．are
C．being
D．have

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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