题目内容

TV set is one of       in the world.
A．most useful inventionB．the most helpful inventions
C．more helpful inventionsD．less useful invention
B

试题分析：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。
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