请问下面这道英语专四语法题为啥选择D而不能选C呢？

Question

The experiment was __ we had anticipated！
A. a success more than
B. more a success than
C. a success as much as
D. as much of a success as
一直对语法里面涉及比较结构的题目不太会做。。

Answer 1

考察表语从句。C， as much as 后面缺少从句引导词what。D, as much of是单独短语（本句中指实验非常成功），后一个as为从句引导词，进一步说明a success是什么样的success.