No doubt ________ he knew the news.
A．thatB．ifC．whetherD．but
A
考查doubt的用法。doubt用于肯定句時(shí)用whether引導(dǎo)同位語(yǔ)從句；用于否定句時(shí)，用that引導(dǎo)。句意：無(wú)疑他知道這個(gè)消息。根據(jù)No可知本句為否定句，句首省略there is，故選A。
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