【題目】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:除非允許,否則你不應(yīng)該進(jìn)入教師辦公室。

考查連詞。when當(dāng)……時(shí);unless除非;because因?yàn)椋?/span>if如果;根據(jù)句意理解可知,后句you are allowed to是前句You are not supposed to enter the teachers’ office的條件,所以這里應(yīng)該用條件狀語從句的連詞,這里表達(dá)的是“除非”,英語是unless,,故選B

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