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the boy's father bought him a large toy train__.A.to play wi

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the boy's father bought him a large toy train__.A.to play with B.to play with it
C.which to play with D.at which to play
那个“it”什么时候加什么时候不加?类似的题很多,求解此语法,
这个是非谓语短语作后置定语,修饰a large toy train,
首先,咱先看看a large toy train 非谓语中做什么,
显然,作宾语,
to do 用作主动形式表被动意思,是说火车玩具被玩.
所以选择A.
对于B,如果有了 it ,那么非谓语中啥都不缺了(不考虑逻辑主语阿.)
火车玩具咱就不知道放哪了不是?所以不能选.
对于加不加it ,主要就是看被修饰词在非谓语中作什么成份,
莫要让it 把 修饰词在非谓语中的位置挤掉,
这种找位置的方法在定语从句也管用.
eg.the boy's father bought him a large toy train ——
A .which the boy can play with B .which the boy can play with it
a large toy train 依然在定于从句中作介词with的宾语,不能让it 挤掉它,所以选A