다음 글의 밑줄 친 부분 중, 어법상 틀린 것을 고르시오.but on july 6, 1885, the scientists were called on③ to administerthe vaccine to asmall boy who had been bitten by a rabid dog
on 뒤에 to부정사는 못오지않나요?전치사가 한꺼번에 2개씩이나 있어서....