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
解析试题分析：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.
考点：考查连词。
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