题目内容
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
A. only if B. until
C. so that D. even though
C
【解析】
试题分析:only if只要……就;until直到;so that以便,所以;even though虽然,即使。句意:弗兰克带了一个口罩,以便他在雾霾天气也能保持健康。故选C。
考点:考查连词辨析
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