单项选择题

Thinking that you know______in fact you don't is not a good idea.

A．what
B．that
C．when
D．which
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单项选择题
This question is too hard, it is______my comprehension.
A．below
B．beyond
C．over
D．without
单项选择题
I suppose you are not serious, ______
A．do I
B．don't I
C．are you
D．aren't you
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