― Has Jackson finished his work today?
― I have no idea, but he ______ it when I saw him this morning


  1. A.
    had done
  2. B.
    would do
  3. C.
    was doing
  4. D.
    would have done
C
考察時(shí)態(tài).句意:今天杰克遜已經(jīng)完成了他的工作嗎?——我不知道，但是當(dāng)我今天早晨看見他時(shí)他正在做。結(jié)合語境可知下文描述的是在過去某個(gè)時(shí)間正在進(jìn)行的動(dòng)作，故用過去進(jìn)行時(shí)態(tài)。選C。
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