If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.-高中英语-n多题

◎ 题干

If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.

A．in, warned, after that	B．at, warned, before which
C．on, informed, after which	D．in, informed, before which

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◎ 解析

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◎ 知识点

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