The students were ________ over the ________ problem，listening to the teacher wi

题干

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

上一题下一题 0.4难度单项选择更新时间:2012-05-27 01:26:43

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