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
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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。