I believe you will do better next time省略了一个词是哪个

I believe you will do better next time省略了一个词是哪个
I believe you will do better next time省略了一个词是哪个

I believe you will do better next time省略了一个词是哪个
that

I believe （that) you will do better next time 望采纳

I believe that you will do better next time.

i believe that you will do better next time

省略了引导词that，即：I believe (that ) you will do better next time.