He________in his lab for eight hours.


  1. A.
    works
  2. B.
    worked
  3. C.
    has worked
  4. D.
    had worked
C
分析:很少有同學(xué)會做錯(cuò)這題,因?yàn)椴簧偻瑢W(xué)認(rèn)為有了for eight hours這樣的時(shí)間狀語就是用現(xiàn)在完成時(shí)。但沒有搞懂for eight hours這種時(shí)間狀語的概念。“for+一段時(shí)間”表示的是動作或狀態(tài)所延續(xù)的時(shí)間長度,如果沒有上下文,沒有別的條件,像本題這樣的句子是應(yīng)該用現(xiàn)在完成時(shí),但不等于有了“for+一段時(shí)間”都是用現(xiàn)在完成時(shí),如這里的he如果是一個(gè)已經(jīng)故世的人,那么很明顯就不可能用現(xiàn)在完成時(shí),因?yàn)楝F(xiàn)在完成時(shí)對work這樣的動詞表達(dá)了“從過去某個(gè)時(shí)候起一直延續(xù)到現(xiàn)在的動作。”
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