单项选择题Thinking that you know ______ in fact you don't is not a good ide
A．A. whatB. thatC. whenD. which
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1.单项选择题" ______ does Mr. Johnson go to London on business"
"At least once a month."
"At least once a month."
A．How many
B．How long
C．How often
D．How
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