题目内容

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

A.Since                 B.Unless

C.As                     D.Although

D


解析:

although引导让步状语从句,表示“虽然……?;但是……”,根据句意可判断出虽然这位老工人在技术知识方面很有限,但他有丰富的经验。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,多前置。as从句多用来解释主句的原因,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“如果不……,除非”。

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