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  3. A primary color is Ait Bwhich cannot Cbe made by Dmixing other colors.

A primary color is Ait Bwhich cannot Cbe made by Dmixing other colors.

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问题 A primary color is Ait Bwhich cannot Cbe made by Dmixing other colors.
选项 A、 
B、 
C、 
D、 
答案A
解析 应改one。分析句子结构可知，本句是which引导的定语从句，但先行词不能用it充当，表示泛指的单数名词时可用one来充当先行词。
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