几个关于as的用法（选择题）回答并给予解释
1,I walk a long way to my work,_______.
a,as it is b,as you know
c,as seems it d,as it seems
我选择D,错了,请写出正确答案并回答为什么,
2,You may take an oral or writen exam _______you prefer.
a,as far as b,as
c,as against d,in so far as
我选D,又错了.
3,I dont know _______the others
a,as much as b,as far as
c,according as d,as good as
我选D,又错了.
4,Morden statesman are often faced with_______problems_______defeated the ancient Romans.
a,the same ...as b,such many...as
c,as...as such d,such...as they