题目内容

– 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
考查虚拟语气.句意:玛丽哭得很伤心._哦,她一定是知道了她的母亲在车祸中严重受伤的坏消息了. “must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。结合语境可知选C.
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