I don't know what illness he suffered from,but I do renmenber he mentioned____in hospital last yearA.to have been B.to be C.having been D.be

I don't know what illness he suffered from,but I do renmenber he mentioned____in hospital last year
A.to have been B.to be
C.having been D.be

C,mention是动词,后面要加宾语,因此用having been形式.

A I guess. mention to do sth.

c