What Tom liked to eat was different from ___[A.what B.that]you had expected.

题目

What Tom liked to eat was different from ___[A.what B.that]you had expected.
并请说明原因谢谢

答案

选A.A.what
what作expected的宾语
that不能做句子成分
意思是“汤姆喜欢吃的东西,与他以前期盼的东西不一样.