______he has limited technical knowledge, the old worker has a lot of experience.

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问题 ______he has limited technical knowledge, the old worker has a lot of experience.

选项 A、Since
B、Unless
C、As
D、Although

答案D

解析句意：虽然这位老工人技术知识有限。但是他经验丰富。根据句意分析可知前后为让步关系，因此此处应当用although (虽然，尽管)来引导让步状语从句。

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