______ do you exercise in a week?
A. How long   B. How far     C. How often
A

試題分析：句意：你一周鍛煉多久？How long多久，對一段時間提問；How far多遠(yuǎn)，對距離提問；How often多久一次，對動作發(fā)生的頻率提問。所以選A。
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