Studentsmustkeeptheireyes________a

发布时间：2020-07-26 16:50:58

Students must keep their eyes ________ and listen to the teacher ________．A.open, carefulB.opened carefulC.open, carefullyD.opened, carefully

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C解析keep sth．adj．open为形容词；修饰listen(to)用副词。
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