______ set of products has its own code, and we can recognize them easily.

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问题 ______ set of products has its own code, and we can recognize them easily.

选项 A、Every
B、Each
C、All
D、None

答案B

解析虽然(A)every后也接单数名词，但通常强调全体，意为“每个，所有”；(C)all表示“全部的，总的”，动词用复数；(D)none多数情况下用作代词，表示“没有人，没有任何东西”。

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