________ he has limited technical knowledge, the old worker has a lot of experience.
A.SinceB.UnlessC.AsD.Although在线课程D
句意：这位老工人虽然专业知识有限，但实践经验丰富。as可以引导让步状语从句，但必须使用倒装语序，即：Limited technical knowledge as he has…，准确理解句意，精确把握主、从句的逻辑关系是解答本题的关键。
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