问题 选择题

The students were ____ over the ____ problem,  listening to the teacher with a ____ expression

on theirfaces.     [ ]

A. puzzled; puzzling; puzzling      

B. puzzled; puzzling; puzzled      

C. puzzling; puzzling; puzzled      

D. puzzling; puzzled; puzzling

答案

答案:C

单项选择题
单项选择题 A1/A2型题