he was limited technical knowledge, the old worker has a lot of experience． [ ]
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________ he was limited technical knowledge, the old worker has a lot of experience．
[]A．Since
B．Unless
C．As
D．Although
试题答案
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．上下句子为转折关系．since表示“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．