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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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