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It’s a rule in my class that our classroom ______ before 6:00 p.m. every day.


  1. A.
    be able to clean
  2. B.
    should be cleaning
  3. C.
    must clean
  4. D.
    must be cleaned
D
试题分析:be able to能,强调自身能力能够做某事;should应该;must一定。句意:每天下午六点前必须打扫教室,在我们班是一条规定。结合语境可知从句主语是动作的对象,故用被动语态,选D。
考点:情态动词及被动语态
点评:情态动词的区别主要在于表达语气的不同,需要结合语境具体分析。语态问题主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态,反之如果是动宾关系,则用被动语态。
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