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【题目】 ___________his technical knowledge was limited, the old worker has a lot of experience.

A. Since B. Unless C. As D. Although

【答案】D

【解析】考查连词的用法。句意:虽然他的技术知识有限,但这位老工人有很多的(工作)经验。since既然;unless除非;as当……时因为;although尽管……,但是……,引导让步状语从句。故选D。

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