______ I admit that the problems are difficult, I don't agree that they can't be solve ( 章节：5 难度：3)_做题室

单项选择题______ I admit that the problems are difficult, I don't agree that they can't be solve ( 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：
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