【題目】【2012 山東濱州】Mary, put on your coat, ______ you'll catch a cold.

A. and B. or C .so D. but

【答案】B

【解析】

試題分析：and意為“和，與”；or意為“否則”；so意為“因此”；but意為“但是”。句意“Mary, 穿上你的外套，否則你將會(huì)感冒”,故選B。

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