1. 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（C）
(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选项不是do, and do ,and do 的句式么？为什么是正确的？
而且不应该说all one has to do with cattle is （to）leave them ……
