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【题目】—What will happen if there is a fire in the building?

—The fire alarm will________ at once.

A.turn offB.go offC.pull downD.turn on

【答案】B

【解析】

句意:——-如果大楼着火会发生什么事? ——-火警马上就响了.

考查动词短语。A. 关闭;B. 进行;爆炸;突然大作;C. 拆毁;D. 打开;结合语境可知,这里表达的应该是突然大作,即马上响起,故选B

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