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You were silly not ________ your car.


  1. A.
    to lock
  2. B.
    to have locked
  3. C.
    locking
  4. D.
    having locked
B
解析:
句子使用“主語+be+adj.+to do”,所以排除C, D兩項,were說明動作發(fā)生在過去,且lock的動作發(fā)生在were之前,所以用不定式完成式。
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