单选题 Everyone asked me where he was, but it was ______ a mystery to me as to them.
A. much of B. as of C. as much of D. such

【正确答案】 C

【答案解析】[解析] as much…as“和……一样是”，如果as much修饰的是由不定冠词限定的可数名词单数时，要用as much(of)a结构。