[求助]新东方语法题

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 corrral 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

答案是（C)，不太明白。is/are后面可以接to do或者doing, 但是后面接do是什么意思呢？

请LZ在发贴前阅读发贴规则，谢谢配合啦。

    

接DO是把TO省略掉了，因为前面出现了to,所以后面是understood了

以下是引用carolhide在2006-5-30 16:45:00的发言：

请LZ在发贴前阅读发贴规则，谢谢配合啦。

 

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刚刚看了，原来都在大全上面，谢谢斑竹。