We must believe in ourselves I think is the most important in our life.A. whereB. whatC

问题补充：

We must believe in ourselves,, I think, is the most important in our life.

A. where

B. what

C. which

D. that

答案：

A. where

B. what

(答案→)C. which

D. that

解析：考查定语从句，先行词为相信我们自己这件事关系词which指代这件事并在从句中作主语。我认为我们必须自信这是生活中最重要的事情。选C