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. I am sorry. I’ve forgotten _____________you that Miss Liu

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. I am sorry. I’ve forgotten _____________you that Miss Liu won’t come.
A. to tell B. telling C. to have told D. having told
答案应该选A.这个句子首先排除C/D,句子的主体时态是现在完成时,C与D的用法都是错的.具体本题的考点在于forget to do sth.和forget doing sth.的区别:
forget to do sth.表示忘记将要做的事情
如:I forgot to finish the math homework.我忘记要完成数学作业了.
forget to doing sth.表示忘记已经做过的事情
I forgot closing the windows when I got out.我出门的时候忘记窗子已经关了.