Rarely such a silly thing.
A. have I heard of
B. I have heard of
C. I have been hearing of
D. have I heard from
网友回答
(答案→)A. have I heard of
B. I have heard of
C. I have been hearing of
D. have I heard from
解析：句意，我很少听到这样糊涂的事。含有否定意义的副词或连词，如not, never, seldom, not only, little, rarely, hardly等放在句首时要用部分倒装句。所谓部分倒装就是把谓语动词的一部分，即助动词、情态动词、系动词移至主语的前面。因为前面有了助动词或情态动词，所以后边的动词要用原形，hear of 听说hear from收到某人的来信，故选A。