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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When I say that someone is in Shanghai for good, I mean that he is there______.
A. to find a good job
B. for tile time being
C. to live a happy life
D. for ever
单项选择题
The teacher, as well as all his students, ______by the dancer's performance.
A. was impressed
B. had impressed
C. impressed
D. were impressed
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