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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

試題分析：句意：弗蘭克經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。根據前后分句意思可知該選C.
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