---We can't be successful _____  we keep on working hard.

          ---I agree with you.

      A. if          B. because      C. unless     D. until

 

【答案】

C

【解析】連詞unless意為“除非……如果不……”，“除了……”，多引導一個否定意義的真實條件句，有時也可引導非真實條件句。

 

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