Question

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

Answer 1

C

解析試題分析：句意：弗蘭克經常戴口罩所以他可以在霧霾天氣里保持健康。So that引導結果狀語從句，only if表示“只要”；even though表示“即使”，until表示“直到”，故選C。
考點：考查連詞的用法。