I prefer his method of solving the problem to yours,______ it is more practical and earlier to be carried out.
A.for which B.for that C.in which D.in that

I prefer his method of solving the problem to yours,___D___ it is more practical and earlier to be carried out.
A.for which B.for that C.in which D.in that在于，因为
我相较于你的方法，更赞赏他解决问题的思路，因为，它更加实用而且能更快投入实施。选D。
句意很连贯，缺少一个表示原因的可以独立使用的不接名词代词的结构，只能选D。其他的for which/that 都是定语从句或者不存在的用法，in which也是一样。你看看，如果把横线换成分号，前后两个分句都能独立存在，所以中间填写内容也应该不牵连前后句，也就是说，它不能拖泥带水，即不可以是定语从句和名词性从句。


参考文献：http://blog.sina.com.cn/calendula28