As your best friend, I will help you all the time _______ you make progress.
A．ifB．whenC．unlessD．though
C
連詞unless意為“除非……如果不……”，“除了……”，多引導(dǎo)一個否定意義的真實條件句，有時也可引導(dǎo)非真實條件旬。
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