◎ 题干
— The problem is very difficult. I'm afraid you can't work it out. 
— _____ or not I can succeed, I'll have a try.

A. If
B. Since
C. Whether
D. As
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— The problem is very difficult. I'm afraid you can't work it out.— _____ or not I can succeed, I'll have a try.[ ]A. If B. SinceC. Whether D. As …”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。