问题补充：
TV set is one of in the world.
A. most useful invention
B. the most helpful inventions
C. more helpful inventions
D. less useful invention
答案：
A. most useful invention
(答案→)B. the most helpful inventions
C. more helpful inventions
D. less useful invention
解析：句意：电视机是世界上最有用的发明之一。这里one of+可数名词的复数，故排除AD；这里用了最高级所以它的前面应该用定冠词修饰。故选B。
如果觉得《TV set is one of in the world.A. most useful inventionB. the most helpful inventions C. mo》对你有帮助，请点赞、收藏，并留下你的观点哦！
