Has he ever been heard about his trip to the lonely island?A. of talkingB. talkC. to talkD

问题补充：

Has he ever been heard about his trip to the lonely island?

A. of talking

B. talk

C. to talk

D. to say

答案：

A. of talking

B. talk

C. to talk

(答案→)D. to say

解析：在主动语态中，hear sb do sth ，而在被动语态中，被省略的to 要加上去。故选D