— _____ do they exercise?  
— Three times a week.

A. How much
B. How long
C. How many
D. How often
D
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科目:初中英語(yǔ) 來(lái)源:0112 月考題 題型:單選題

— _____ do they exercise?  
— Three times a week.
[     ]
A. How much
B. How long
C. How many
D. How often

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