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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Thinking that you know______in fact you don't is not a good ide
A． whatB. thatC. whenD. which
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History is a record of mankind; different historians, ______, interpret it differently.
A．therefore
B．on the contrary
C．however
D．consequently
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