Question

【题目】It was a pity that the policeman failed to find such a person ____ had been described by the witness.

A. that B. what C. as D. which

Answer 1

【答案】C

【解析】本句考查as引导的限制性定语从句。as在从句中做主语，先行词person被such修饰，构成such … as结构，故选C。