Never in my life such a thing.
A. I have heard or have seen
B. have I heard or seen
C. I have heard or seen
D. did I hear or see
网友回答
A. I have heard or have seen
(答案→)B. have I heard or seen
C. I have heard or seen
D. did I hear or see
解析：可联系答.案.网客服索取。