it () the best selling series of children's books in history Ahas become Bbecame Cbecomes 为什么选Ait () the best selling series of children's books in historyAhas become Bbecame Cbecomes 为什么选A

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it () the best selling series of children's books in history Ahas become Bbecame Cbecomes 为什么选Ait () the best selling series of children's books in historyAhas become Bbecame Cbecomes 为什么选A
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it () the best selling series of children's books in history Ahas become Bbecame Cbecomes 为什么选Ait () the best selling series of children's books in historyAhas become Bbecame Cbecomes 为什么选A
it () the best selling series of children's books in history Ahas become Bbecame Cbecomes 为什么选A
it () the best selling series of children's books in history
Ahas become Bbecame Cbecomes 为什么选A

it () the best selling series of children's books in history Ahas become Bbecame Cbecomes 为什么选Ait () the best selling series of children's books in historyAhas become Bbecame Cbecomes 为什么选A
由in history 可知,有史以来,它是最畅销的,到目前为止还没有被超越过,这个就必须用完成时,
同时用排除法也可以知道选A.
became,表过去是的,现在不是,与题意不符.
becomes表一般性的情况,这里很明显介绍的是以前发生的一件事.与题意也不符,所以综上所述,A最为恰当.

表示一种状态,应该用现在完成时态。而且一直都会保持畅销的这样一种状态
B表示一般过去式,但是现在也是啊!所以不妥,没有A 好
C表示经常情况 ,具有周期性的。 不是很好