Mary seems the bad news, for she looks nice and happy.
A. not to have learned
B. not to be hearing
C. not having learned
D. not to be
网友回答
(答案→)A. not to have learned
B. not to be hearing
C. not having learned
D. not to be
解析：考查不定式用法。不定式的完成式表示该动作发生在谓语动作之前，否定式是在不定式符号前面直接加Not.句意：Mary似乎还不知道那个坏消息，因为她看上去很开心。故A正确。