885 sec 18 - 11

waterflea

It is an oversimplified view of cattle raising to say that all one has to do with cattle is leave them alone while they feed themselves, corral them, and to drive them to market when the time is ripe.
(A) all one has to do with cattle is leave them alone while they feed themselves, corral them, and to
(B) all one has to do with cattle is to leave them alone to feed themselves, to corral them, and
(C) all one has to do with cattle is leave them alone while they feed themselves and then corral them and
(D) the only thing that has to be done with cattle is leave them alone while they feed themselves, corral them, and
(E) the only thing that has to be done with cattle is to leave them alone while they feed themselves, to corral them, and

C和D有什么区别？为啥只有C对？怎么分析C的语法结构？

sbbi

D
1. over-redundant
2.被动语态to be done和leave,corral不一致

waterflea

哪里有被动语态啊，我怎么看不出来？请指点。谢谢。