题目内容

—____ do you clean your room?
—Every two days.
A.How soon
B.How long
C.How much
D.How often
D
考查疑问词:A. How soon多久一次,B. How long多长时间,C. How much多少, D. How often多久一次,根据答语的内容Every two days,可知答案为D,表示多久···一次。故选D
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