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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单项选择题
______ does Mr. Johnson go to London on business At least once a month.
A．How many
B．How long
C．How often
D．How
单项选择题
This question is too hard, and it is ______ my understanding and comprehension.
A．below
B．beyond
C．over
D．without
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