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。
考點：考查連詞的用法。

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