应该填whatever,因为buy是及物动词,后面接宾语.而found后面也需要一个宾语.所以只能是whatever.如果用whichever的话,found后面应该加上一个it或them,作为形式宾语.整句话的意思是：他的父母让他去买任何他发现对学习有帮助和需要的书籍.
his parents asked him to buy( )books he found useful and nes
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