You will lose the game _________ you try your best.
A. when                B. if                  C. unless
C
連詞unless意為“除非……如果不……”，“除了……”，多引導(dǎo)一個(gè)否定意義的真實(shí)條件句，有時(shí)也可引導(dǎo)非真實(shí)條件句。
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