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29.There is a water pump on ____ bank of the river.

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29.There is a water pump on ____ bank of the river.
A.any B.either C.both D.each of the
此题答案为B,但为什么不能选择D呢?
首先只能在B,D两项选.因为A,C修饰不了此类问题,因为bank是单数,所以选B,若bank是复数,则可用each,句子是There is a water pump on each banks of the river.