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

A. SinceB. unless

C. onceD. when

【答案】B

【解析】

考查連詞詞義辨析。A. since既然；B. unless除非；C. once一旦……；D. when當(dāng)……時。句意：外婆的手機總是關(guān)機，除非她在等電話。根據(jù)句意可知此處表示“除非”，故B項正確。

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