1:There could be no doubt ______ he was trying to hide something from us.

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1:There could be no doubt ______ he was trying to hide something from us.
1:There could be no doubt ______ he was trying to hide something from us.

1:There could be no doubt ______ he was trying to hide something from us.
that

that

that 引导同位语从句补充说明doubt

that,weather在有doubt的句子中的区别在于否定句中用that,疑问和肯定句中weather,这是否定句,因此用that
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