单项选择题

-- I'm not sure ______ Mr Wang goes to see his parents.-- Twice a week.

A． how long
B． how often
C． how soon
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单项选择题
Sorry, I took your MP3 by mistake I'll be ______ careful next time.
A． most
B． more
C． much
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Today, the forests have almost gone. People must ______ down too many trees.
A． stop from cutting
B． be stopped to cut
C． be stopped from cutting
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