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

Many a way （） tried already.

A．has been
B．are
C．being
D．have

单项选择题

I don't think Jason's serious about going to Africa,（）

A．don't he
B．don't I
C．will you
D．is he

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