答案选c,因为后面exercise是动词.语句问的是一般现在时.第二人称,所以排除d 和A.often 表示的是一般现在时,所以不能用be 动词.而用do.回答：I do exercise 3 times a day.
-How often ＿＿ you exercise?A.is B.are C.do
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