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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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 will tell you everything ______ he said about it.
A．what
B．which
C．that
D．on which
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