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—             do you write to your parents? 
— Once a month.

A. How long
B. How often
C. How
D. How much
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科目：初中英語 來源：期末題 題型：單選題

—             do you write to your parents? 
— Once a month.
[     ]
A. How long
B. How often
C. How
D. How much

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