다음 중 문법적으로 옳지 않은 문장을 고르시오.


① Some of the things that can go wrong have been
highlighted by the economic downturn. ? We spent about two decades largely completing domestic
projects. ? Many of the students who were sent abroad in the 1990s
have since returned home. ? Robert Pattinson has been voted the sexiest alive man in
a new poll.