It'snotknownhowthebuilding____

发布时间：2020-07-27 18:35:42

It's not known how the building ________and how long it has ________.A.was on fire; caught fireB.was on a fire; caught a fireC.caught fire ; been on fireD.caught a fire; been on a fire

网友回答

C解析均为“着火”．“catch fire”强调着火的一瞬间，而“be on fire”则强调火烧的过程。
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