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        1. (2005·天津)

          You should understand the traffic rule by now. You've had it ________ often enough.

          [  ]

          A.explaining
          B.to explain
          C.explain
          D.explained

          答案:D
          解析:

          此題考查have sth. done結(jié)構(gòu)。itexplain之間為被動(dòng)關(guān)系。


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