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Sometimes the air is too dirty to breathe and the rivers are

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Sometimes the air is too dirty to breathe and the rivers are too dirty to swim in or to _________.
A.take from B.take water from C.drink D.drink it
请问为什么?
Sometimes the air is too dirty to breathe and the rivers are
B 的确是正确答案.
这里包含了这样一层关系:
swim in the river 在河里游泳
take water from the river 从河里取水
所以用动词不定式表达时介词不能丢:
the rivers are too dirty to swim in or to take water from
河水太脏了不能在里面游泳也不能从里面取水