Sorry i haven't been able to do _____ i should

问题描述:

Sorry i haven't been able to do _____ i should
a.as many as
b.as much as
c.as far as
d.move than
请问a c d为什么不对?错在哪?

句意是:抱歉,我没能尽我所能地多做些事.
do sth
do 后面是要跟名词的,不能跟形容词.(当然,也可跟副词.)
much 相当于 a lot,可作名词,但其他三个不是名词,语法上不对,故选b
希望对你有用 :)