The old man had three sons, all of______served in the army during the war.A.them

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问题 The old man had three sons, all of______served in the army during the war.

选项 A.them            
B.that
C.which            
D.whom

答案D

解析考查“介词+关系代词”引导的定语从句。首先,两个分句之间没有连词,所以该句是非限制性定语从句,排除A、B选项。of whom只能指人,of which只能指物。本句先行词是three sons,所以用of whom引导。句意为“这位老人有三个儿子,他们都在战争期间当了兵”。
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