题目内容
---You look very healthy. ________do you exercise?
-----I exercise three times a week.
| A．How often | B．How many |
| C．How much | D．How soon |
A
解析试题分析：句意：你看起来很健康。你多久锻炼一次？我每周锻炼三次。How often多久一次，对动作发生频率提问；How many多少，对可数名词的量提问； How much多少，对不可数名词的量提问；How soon多久以后，对短语“in + 一段时间”提问。所以选A。
考点：考查疑问短语。
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