Onething’sforsure,thefire_____bys

发布时间:2020-07-12 13:06:58

One thing’s for sure, the fire _____by some cigarette butts.A.might causeB.could have causedC.must have been causedD.should be caused

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C解析考查情态动词。must have done过去一定做过,句意:确定的一件事,大火是被一些烟蒂引起的。
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