Jinro Ballantines Co., a leading distiller, witnessed its world-renowned brand Ballantine's, along with the homegrown Imperial brand, continue to suffer a sales pinch.

위 문장의 continue가 어떻게 쓰인 건가요?
목적보어로 쓰인 원형부정사인가요?
원형부정사가 맞다면 왜 굳이 원형으로 쓴 건가요?
해석에 차이라도?

콤마도 많고 정확하게 모르겠어요.