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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:843

   – Have they found out the _____ of the fire?
--  Yes. It was a cigarette end that _____ the fire.

A.cause; started B.reason; caused
C.causing; caused D.reason; cause
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–Havetheyfoundouttheofthefire?