高考英语介词和介词短语练习91
题目内容

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

2021-07-24

A.in, warned, after that

B.at, warned, before which

C.on, informed, after which

D.in, informed, before which

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