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
Thinking that you know ______ in fact you don't is not a good idea.
A．what
B．that
C．when
D．which
单项选择题
Before the child went to bed, the father asked him to ______ all the toys he had taken out.
A．put off
B．put up
C．put away.
D．put out
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