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:only if只要……就;until直到;so that以便,所以;even though雖然,即使。句意:弗蘭克帶了一個口罩,以便他在霧霾天氣也能保持健康。故選C。
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