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