2. 外语
  3. ______ he has limited technical knowledge, the old worker has a lot of experience.

______ 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 since和as引导原因状语从句，since从句表示从上文中已经很清楚或不言自明的原因，语气较because从句弱，较as从句强，有时不是直接的或根本的原因，而只是推理，多置于句首。as从句多用于解释主句的原因，语气较弱，常表示显而易见的理由，多用于日常会话。unless引导条件状语从句，意为“除非”。
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