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No doubt ________ he knew the news.
A.thatB.ifC.whetherD.but
A
考查doubt的用法。doubt用于肯定句时用whether引导同位语从句;用于否定句时,用that引导。句意:无疑他知道这个消息。根据No可知本句为否定句,句首省略there is,故选A。
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