题目内容：

____do you exercise a week ? —Three times. A.How long B.How much C. How many times D.what

优质解答

从回答中看出,是次数,所以答案是“C”.
How many times do you exercise a week?—Three times.
how long 是指时间的长度,没有次数的概念,不能用.how much 是指不可数的多少,不能用.what 当然在淘汰之中.“C” 是对的.