---Your office is very dirty．

---I know．It ______ for three days．


  1. A.
    hasn’t’ cleaned
  2. B.
    didn’t clean
  3. C.
    hasn’t been cleaned
  4. D.
    wasn’t cleaned
C
辦公室是被打掃的，而且到說話時(shí)已有三天沒打掃了，故用現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)形式。
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