attend leadership seminars as they will likely become _______ staff someday.

(A) manage

(B) managerial

(C) manages

(D) to manage

이문제인데 become 다음에는 to 부정사가 안오나요? 왠지 become to 가 익숙한데

또 become 다음에 staff라는 가산명사가 오는데 왜 한정사가 없죠??

I become a teacher 은 teacher에 한정사 a가 붙는데 이건 왜 한정사가 안붙나요 너무 궁금해요 ㅋㅋㅋ