There is no doubt______Herbert is the most industrious student in our class.

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问题 There is no doubt______Herbert is the most industrious student in our class.

选项 A、whether
B、what
C、that
D、if

答案C

解析 名词doubt用在肯定句中,其后的同位语从句用whether引导,若用在否定句中则由that引导,故选C。
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