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------How often ______ she exercise? ---...

------How often ______ she exercise?

------Twice a week.

A. do   B. does  C. doing D. Did

 

B 【解析】 试题分析:句意:---她多久锻炼一次?---一周两次。do用于一般现在时第三人称单数以外的人称;does用于一般现在时第三人称单数; doing是do的现在分词或动名词形式;did用于一般过去时态。结合语境,所以选B。 考点:考查助动词。  
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