【題目】---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】

試題分析：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)非真實條件句。

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