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One thing’s for sure, the fire by some cigarette butts. A. might cause B. could

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One thing’s for sure, the fire by some cigarette butts. A. might cause B. could

 One thing’s for sure, the fire _____by some cigarette butts.

       A. might cause                         B. could have caused 

C. must have been caused                 D. should be caused

试题答案

C