Mail or gifts posted by companies to customers____advertisingA. are another B.is another选哪个?为什么?那和or 没有关系吗?A+or+ B不是就近原则吗?

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Mail or gifts posted by companies to customers____advertising
A. are another B.is another
选哪个?为什么?那和or 没有关系吗?A+or+ B不是就近原则吗?

B
补充:another 就很清楚了呀,是单数