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Mary seems _______ the bad news, for she looks nice and happy.  
A．not to have learnedB．not to be hearing
C．not having learnedD．not to be
A

試題分析：考查不定式用法。不定式的完成式表示該動作發(fā)生在謂語動作之前，否定式是在不定式符號前面直接加not.句意：Mary似乎還不知道那個壞消息，因為她看上去很開心。故A正確。
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