问题

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

正确答案是：

同类题型

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选出相邻字母顺序正确的一项：____________。

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