Matt is now getting on very well with his new job and he earns ______ he did last year
A.twice as much as
B.as twice much as
C.twice as many as
D.as twice many as
请写出详细的过程和思路，谢谢，尤其是解释A和C，我觉得many和much都是形容词或者副词的原级

以下是倍数的表示方式：
A is n times as great（long，much，…）as B.（①） A is n times greater （longer， more，…）than B.（②） A is n times the size （length， amount，…）of B.(③) 以上三句都应译为；A的大小（长度，数量，……）是B的n倍[或A比B大（长，多，……）n-1倍]. Eg. This book is three times as long as （three times longer than，three times the length of ）that one. 这本书的篇幅是那本书的3倍（即长两倍）。 注：当相比的对象B很明显时，than（as，of）B常被省去。
这个好像你问过一次了，记住上面的固定搭配，不符合的就是错的，所以说B和D明显排除，A和C的区别就在于many和much，因为这里是说的他赚的钱是去年的两倍，money不可数，所以要用much，选A。