单项选择题

Many a way （） tried already.

A．has been
B．are
C．being
D．have

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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

单项选择题

（）he will go to Germany is not decided.

A．Who
B．if
C．That
D．Whether

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