---Don't put the waste on the ground, young man.

---Oh, I'm sorry．I ________ the dustbin there．


  1. A.
    hadn’t seen
  2. B.
    didn’t see
  3. C.
    can’t see
  4. D.
    wasn't seeing
A
如果描述剛才一瞬間進(jìn)行的動(dòng)作用過(guò)去進(jìn)行時(shí)，如I wasn't listening，過(guò)去某一結(jié)果用一般過(guò)去時(shí)，如I didn't hear it．
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