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【题目】You are not supposed to enter the teachers’ office ________ you are allowed to.

A.whenB.unlessC.becauseD.if

【答案】B

【解析】

句意:除非允许,否则你不应该进入教师办公室。

考查连词。when当……时;unless除非;because因为;if如果;根据句意理解可知,后句you are allowed to是前句You are not supposed to enter the teachers’ office的条件,所以这里应该用条件状语从句的连词,这里表达的是“除非”,英语是unless,,故选B

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