Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.

A．only ifB．until
C．so thatD．even though

C

解析試題分析：句意：弗蘭克經(jīng)常戴著面具為的是在霧霾天氣他可以保持健康。only if只有；until直到；so that以便; 結果，以致；even though即使，縱然。根據(jù)前后分句意思可知該選C.
考點：考查連詞。

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