In addition to what above, his speech was also involved in some big issues of our society.
A. mentioned
B. is mentioned
C. was mentioned
D. mentions
网友回答
A. mentioned
B. is mentioned
(答案→)C. was mentioned
D. mentions
解析：mention和其主语之间是被动关系，故用被动语态，且根据“was also involved”故用一般过去时，故选C。