there is doubt 和there is no doubt 用法There is more

问题补充：

there is doubt 和there is no doubt 用法There is more and more doubt

答案：

应该要用that 引导同位语从句

======以下答案可供参考======

供参考答案1:

there is no doubt that 否定就用that

there is doubt whether/if 肯定就用whether/if，说明有疑问。

老师祝你学习进步！

望采纳，多谢！^_^

供参考答案2:

whether