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
Beijing is well ______ its beautiful scenery and the Great Wall.
A．known as
B．known to
C．known about
D．known for
单项选择题
Any student who ______ his homework is unlikely to pass the examination.
A．reduces
B．offends
C．practices
D．neglects
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