【題目】 Don't come into the office_______you are allowed

A. if B. when C. until

【答案】C

【解析】

試題分析:句意:沒有允許不要進入辦公室。A. if如果,表示條件; when當……時,表示時間;C. until直到,在……之前,表示時間。not…until…:直到……才……,(在……之前不……),直到允許你,才進辦公室來。故選C。

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