[题目]Granny always keeps her cellphone switched off she's expecting a call．A. SinceB. unlessC. onceD. when 题目和参考答案——青夏教育精英家教网—

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【题目】Granny always keeps her cellphone switched off _________she's expecting a call．

A. SinceB. unless

C. onceD. when

【答案】B

【解析】

考查连词词义辨析。A. since既然；B. unless除非；C. once一旦……；D. when当……时。句意：外婆的手机总是关机，除非她在等电话。根据句意可知此处表示“除非”，故B项正确。

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