题目内容
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
试题分析:句意:弗兰克经常戴着面具为的是在雾霾天气他可以保持健康。only if只有;until直到;so that以便; 结果,以致;even though即使,纵然。根据前后分句意思可知该选C.

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