题目内容

He________in his lab for eight hours．


  1. A.
    works
  2. B.
    worked
  3. C.
    has worked
  4. D.
    had worked
C
分析：很少有同学会做错这题，因为不少同学认为有了for eight hours这样的时间状语就是用现在完成时。但没有搞懂for eight hours这种时间状语的概念。“for+一段时间”表示的是动作或状态所延续的时间长度，如果没有上下文，没有别的条件，像本题这样的句子是应该用现在完成时，但不等于有了“for+一段时间”都是用现在完成时，如这里的he如果是一个已经故世的人，那么很明显就不可能用现在完成时，因为现在完成时对work这样的动词表达了“从过去某个时候起一直延续到现在的动作。”
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He _____ in his English Test Paper. His teacher was very angry with him.

[     ]

A. makes some mistakes
B. make a mistake
C. made many mistakes

He _____ in his English Test Paper. His teacher was very angry with him.

A．makes some mistakesB．make a mistake
C．made few mistakesD．made many mistakes