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[单选题]
The students were ________ over the ________ problem,listening to the techer with ________ expresThe students were ________ over the ________ problem,listening to the techer with ________ expressi
A.puzzled;puzzling;puzzling
B.puzzled;puzzling;puzzled
C.puzzling;puzzling;puzzle
D.puzzling;puzzled;puzzling
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