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_____ are listening to their teacher.

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_____ are listening to their teacher.
A.All students B.All of the students
我知道应该选择B
但是想知道A为什么错误?all做形容词不能这么修饰名词么?
_____ are listening to their teacher.
all当然可以修饰名词,错误在于A缺少定冠词“the”,句子后部分有their,表明students是特指,特定的对象.所以必须有the修饰
正确:All the students are listening to their teacher.或B选项