2. 外语
  3. I have no doubt ______ he will overcome all his difficulties.

I have no doubt ______ he will overcome all his difficulties.

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问题 I have no doubt ______ he will overcome all his difficulties.
选项 A、whether
B、when
C、that
D、if
答案C
解析 that作从属连词，无实在意义，可用宋引导同位语从句，同时要注意：如果doubt用在否定句中，与其相关的名词性从句要用that而不能用whether或if引导，如：There is no doubt that the whole story was invented．毫无疑问整篇故事全是虚构的。I don’t doubt that John will come on time．约翰会准时来，对这一点我毫不怀疑。如果doubt用在肯定句中，与其相关的名词性从句一般要用whether或if而不能用that引导
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