Tom was that he couldn’t understand difficult sentence.A. so a stupid boy; suchB. a so s

问题补充：

Tom was that he couldn’t understand difficult sentence.

A. so a stupid boy; such

B. a so stupid boy; a such

C. so stupid a boy; a such

D. so stupid a boy; such a

答案：

A. so a stupid boy; such

B. a so stupid boy; a such

C. so stupid a boy; a such

(答案→)D. so stupid a boy; such a

解析：本题考查状语从句。so和such用法分别为：so+形容词+（a/an）+名词，such a/an +形容词+名词，故选D。