【正确答案】 A

【答案解析】[精析] 本题考查的是副词用法。not so good as意为“不如…好”，Too意为“太”，such意为“如此，这般”，后面不接形容词。
[知识拓展] 肯定句中，不可用so...as...，比如可以说，He is as tall as his brother，(他与弟弟一样高)但不可以说He isn't so tall as his brother.