.________ gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories.A．UnlessB．In caseC．ProvidedD．Unt-高中英语-n多题

◎ 题干

.________ gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories.

A．Unless

B．In case

C．Provided

D．Until

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◎ 解析

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◎ 知识点

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