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【题目】---Can students go online during lessons?

---They can’t ________ it is for that lesson.

A. ifB. unlessC. untilD. while

【答案】B

【解析】

句意:——学生上课时能上网吗?他们不可以,除非为了上那堂课。本题考查连词辨析,A.如果;B.除非;C.直到;D.当……时候。答语是条件状语从句,根据句意结构可知,需要unless连接,故选B

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