I doubt ___Tom and his sister have arrived by now.选填whether 还是that?用that为什么不对？字典上有例句：I doubt that John will come.

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Idoubt___Tomandhissisterhavearrivedbynow.选填whether还是that?用that为什么不对？字典上有例句：IdoubtthatJohnwillcome.Id

I doubt ___Tom and his sister have arrived by now.选填whether 还是that?用that为什么不对？字典上有例句：I doubt that John will come.
I doubt ___Tom and his sister have arrived by now.选填whether 还是that?
用that为什么不对？
字典上有例句：
I doubt that John will come.

I doubt ___Tom and his sister have arrived by now.选填whether 还是that?用that为什么不对？字典上有例句：I doubt that John will come.
whether 是否
补充：那是指对“约翰会来”这个说法或事实表示怀疑,而一般来说doubt怀疑的内容应该是“是否”

whether，引导名词从句，表示是否
我不知道汤姆和他姐姐到了没。

whether

填whether，因为I doubt后有两种可能，是否-----

使用whether.
doubt如果是动词引导宾语从句时，如果主句是肯定句，则宾语从句的引导词可用if/whether.
如：I doubt if/whether he is a student.
当然，如果此宾语从句中含有or/or not时，只能使用whether.

whether

两个都可。
doubt
后接宾语从句时，如 主句为肯定句时 用 if 或 whether 连接，如 主句为否定句或疑问句时 用 that 连接] 不信任，不相信，怀疑，疑惑,不能肯定，拿不准，对…没准儿
I doubt whether /if he will come
我怀疑他是否愿意参加。
that连接]认为…未必可能：...

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两个都可。
doubt
后接宾语从句时，如 主句为肯定句时 用 if 或 whether 连接，如 主句为否定句或疑问句时 用 that 连接] 不信任，不相信，怀疑，疑惑,不能肯定，拿不准，对…没准儿
I doubt whether /if he will come
我怀疑他是否愿意参加。
that连接]认为…未必可能：
I doubt that he was invited.
我看他未必受到了邀请。
I don't doubt that she'll come
我肯定她会来的。
根据不同的上下文和词义
I doubt whether he will come 我拿不准他是否回来。
I doubt that he will come 是我看他未必会来。

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I doubt ___Tom and his sister have arrived by now.选填whether 还是that?用that为什么不对？字典上有例句：I doubt that John will come. I doubt ___the news ___Tom told me was true.A.that ;if B.if;that C.whether;what D.if;which这道题选B,为什么不能选D?请知道的人告诉我, ：） I doubt it I think it ___Tom belong to还是belongs to 英语翻译相信别人Have faith in othersBelief is a happier state of mind than doubt and suspicion.By this I live,for if I don’t have faith in others,who will believe in me?I would rather believe in a thousand people,friends and strangers,and h doubt 用法I doubt whether/ifI don't doubt thatThere's some doubt whetherThere's hardly/no/little doubt that 一般是I doubt .还是I doubt it. I doubt it怎么念 I doubt that I don't doubt whetherI doubt that 和I don't doubt whether这两个句型对吧？ If i do well,I have no doubt that those come after me will do as well and even better Did you e___ hear the story?单词天什么我的爸爸是计算机工作者，he often gets the information from the I ___Tom hurt himselfe badly,and he could h____ move As your sister,I feel sad.But I know this day will come sooner or later…I doubt that whether you h 1.I have no doubt in my mind _____ they will be glad to see me.A.that B.how C.why D.whether2.After leaving school,he sold newspapers and delivered mail.(同意)After ______ _______ school,he sold newspapers and delivered mail.3.Jack studies English h Doubt me ,hurt me ,and kill me. i doubt i ever i doubt i ever will是啥意思 i never doubt that… i doubt if/whether 都是什么意思阿i never doubt that…i doubt if/whether都是什么意思阿 I never doubt 后填 wheater that? I doubt 的用法有哪些?