One thing’s for sure, the fire _____by some cigarette butts.
A．might causeB．could have caused
C．must have been causedD．should be caused
C
考查情態(tài)動(dòng)詞。must have done過(guò)去一定做過(guò)，句意：確定的一件事，大火是被一些煙蒂引起的。
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