Do you doubt we will defeat Class Two in this basketball mat

C
doubt后接从句时,要视具体的情况而确定是用that还是用whether引导.
通常在否定和疑问结构中,用that引导从句.
如：I don”t doubt that he can finish the task on time.我相信他能按时完成任务.
Do you doubt that she will succeed?你怀疑她会成功吗?
而在肯定结构中,则要用whether或if来引导
如：I doubt whether they can swim across the river.我怀疑他们能否游过河去.
He doubts if she will keep her word.他不敢肯定她是否会遵守诺言.