英语填句,急

题目

英语填句,急
Tom is believed to be____________________his brother who is studying in a famous university.
A as a good boy as
B good a boy as
C as a boy good as
D as good a boy as

答案

D
as+adj.+a/an+n.+as
as...as的用法.
前面的as 为副词,不能直接修饰名词,所以应该修饰形容词.