– Mary was crying sadly.
-- Oh, she ________ the bad news that her mother was badly injured in the accident.
A．must knowB．might have knownC．must have knownD．should have known
C
考查虛擬語(yǔ)氣.句意:瑪麗哭得很傷心._哦,她一定是知道了她的母親在車禍中嚴(yán)重受傷的壞消息了. “must+have+done”表示對(duì)過(guò)去事情的肯定推測(cè)，譯成“一定做過(guò)某事”，該結(jié)構(gòu)只用于肯定句。結(jié)合語(yǔ)境可知選C.
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