All the documents must be kept confidential, so all employees are advised to check that all doors are locked properly______leavi

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问题 All the documents must be kept confidential, so all employees are advised to check that all doors are locked properly______leaving the office.

选项 A、before
B、until
C、from
D、during

答案A

解析 词汇:介词1.这是一道词汇题,选项均为介词。2.原文的意思是“离开办公室前要关好门”,因此(A)before为正确选项。
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