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
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单项选择题
You two have got a lot______.
A．in general
B．in common
C．in all
D．in any case
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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