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

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

选项 A、 
B、 
C、 
D、 

答案A

解析 应改为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以用one来充当先行词。
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