we doubt _____he will keep his promise

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we doubt _____he will keep his promise
A whether B that
请问这里不能用B 选择的原因后面不是接THAT吗

doubt 是“怀疑”,后面应该跟一个不确定的whether"是否" 所引导的宾语从句,而that这个连词却没有“是否”的词义,故错误.
再问：在肯定句中，doubt 后面也可以接 that 引导的宾语从句，但表示疑虑较大或“不相信”。 We doubt that they can complete the work ahead of time. 我们不相信他们能提前完成这项工作。 I doubt that he will come. 我看他未必会来。那这句话又如何解释？和上面情况是相似吗
再答： I doubt that he will come. 中用that就怀疑了一种情况：对他的到来表示怀疑=他来不了 we doubt __whether___he will keep his promise中用whether就怀疑了两种情况：对他的到来表示怀疑=他来不了+他能来；根据表达的需要，用that只能有一种结果，而用whether就会有两者结果。

A:i doubt if he will keep his promise,这句话的语法对吗?意思是不是：我怀疑他是否会 I will keep promise forever. "You can depend on that he will keep his promise."这句话的语病是什么? The lawyer is very r____ .I'm sure he will keep his promise until the last minute of his life and i will keep my promise ______ will I doubt his innocence. we will keep going He （doubt）if she will keep her word I'll keep my words/promise,hope so will The students promise that they will keep the classroom clean i have no doubt _______he will overcome all his difficulties We promise that we will plant more trees.(意思相同)