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There are so many kinds of mp5 in the shop

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There are so many kinds of mp5 in the shop
A.what to buy B.which to buy
为什么
There are so many kinds of mp5 in the shop
A
重新整理了一下
这题主要不是考意思的区别了
如果要选B的话,应该改成 which one to buy
例如:I can't decide which one to buy ,because there are so many toys for me to choose. 我不能决定到底买哪一个玩具,因为这里有太多的玩具让我挑选.cant应该是can't 才对.
表示在多个中择一
因为后文的回答是We can not decide(),分析句子结构已经具有完整的主语与谓语,那么后文不可能再出现一个谓语,因此只能用不定式或者动词ing形式充当宾语
句子可以变成We can not decide to buy ()=we can not decide () to buy
因为句中缺少一个宾语,所以后文必须还它一个宾语,这里可以用
what相当于something that,指代上文的MP5
或者是用which one,one作为实际宾语,which作为形式宾语