【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(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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