[题目] ------How often she exercise?------Twice a week.A. do B. does C. doing D. Did 题目和参考答案——青夏教育精英家教网—

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【题目】 ------How often ______ she exercise?

------Twice a week.

A. do B. does C. doing D. Did

【答案】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。

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