It's obvious that in a system _______ every decision is made on the basis of tradi...

问题描述:

It's obvious that in a system _______ every decision is made on the basis of tradi...
It's obvious that in a system _______ every decision is made on the basis of tradition alone,it may be difficult to achieve progress.
A.that B.when C.where D.which
但是不太清楚是怎么分析来的.

where后跟的是一个状语从句,'every decision is made on the basis of tradi..."这是一个完整的句子了,需要修饰的只能是状语,连接状语从句的只能是where,或者when,在这个句子中,表示的是一个环境(系统),所以用where.
例如:I forget where I put it.It is the place where we first met.