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一道高中英语单选题Tom works so hard that there's no doubt__he will pa

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一道高中英语单选题
Tom works so hard that there's no doubt__he will pass the exam.
A.if B whether C that
一道高中英语单选题Tom works so hard that there's no doubt__he will pa
选c
(1)在否定句和疑问句中,doubt后面接that引导的宾语从句.例如:
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?
(2)在肯定句中,doubt后面一般接whether或if引导的宾语从句.例如:
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.
注意: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”.