单项选择题

A． Once or twice a month
B．Twice or three times a month.
C． Three or four times a month.
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单项选择题
C
单项选择题
A．She doesn’t know Professor Zhang at all. B．She’s lost her voice and can’t talk.C．She’s very busy at the moment
A．She doesn’t know Professor Zhang at all.
B．She’s lost her voice and can’t talk.
C．She’s very busy at the moment
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