Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
A．only ifB．untilC．so thatD．even though
C

試題分析：句意：弗蘭克經(jīng)常戴口罩所以他可以在霧霾天氣里保持健康。So that引導(dǎo)結(jié)果狀語從句，only if表示“只要”；even though表示“即使”，until表示“直到”，故選C。
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