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---_______should we clean the library? -...

---_______should we clean the library?

--- You should clean the library at least twice a week .

A. How many      B. How much

C. How long     D. How often

 

D 【解析】 试题分析:句意:-我们应该多久打扫一次图书馆?-你们应该每周至少打扫图书馆一次。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 long意为“多久、多长时间”,主要是对一段时间进行提问,答语通常是“for + 一段时间”等,它可用于各种时态。how often意为“多久一次”,用来提问在某一特定的时间进行某个动作的次数,答语通常是always,usually,often,sometimes,once/twice a day/month等。所以选D。 考点:考查疑问词辨析。  
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