______ I admit that the problems are difficult, I don't agree that they can't be solved. ( 章节：5 难度：3)
- A、For fear that
- B、Because
- C、While
- D、Until
正确答案:C
答案解析:有
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______ I admit that the problems are difficult, I don't agree that they can't be solved. ( 章节：5 难度：3)
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