______ I admit that there are problems, I don’t think that they cannot be solved.

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问题 ______ I admit that there are problems, I don’t think that they cannot be solved.

选项 A、Unless
B、Until
C、As
D、While

答案D

解析 状语从句。根据上下文语义,此处需要一个表示让步语气的连接词,所以选择while。其他选项中,unless表示“除非”;until表示“直到”;as表示“当……时候”,as引导让步状语从句则必须倒装,强调部分置于句首。
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