◎ 题干
Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
A.only ifB.untilC.so thatD.even though
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.A.only ifB.untilC.so thatD.even though…”主要考查了你对  【并列连词】【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。