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24.The students were ____ over the ____ problem, listening to the teacher with a ____ expression on their faces.

A.puzzled; puzzling; puzzling B.puzzled; puzzling; puzzled
C.puzzling; puzzling; puzzled D.puzzling; puzzled; puzzling
科目 英语   题型 单选题   难度 较易
知识点: 谓语
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