Nowadays consumers become more and more practical and buy only____ they need.
问题描述：
Nowadays consumers become more and more practical and buy only____ they need.
A.where
B.which
C.when
D.what
但是D为什么不可以呢?
答
解析：因为这个题缺少的是状语,来修饰buy的,what不能修饰状语
希望帮到你题干中有明确指出缺状语吗？buy what they need也说得通啊what不能充当修饰定语从句的关系代词，如果非要这样说，可以将what改成that