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。
No doubt ________ he knew the news. A．that B．if C．whether D．
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