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问题: 英语问题

the students entered the classroom ,smiling and( ),and( )down to have their lessons
a talking;sitting
b talking;sat
为什么选b不选a呢
能分析一下这几个动词吗

解答:

smiling and talking 是状语,补充说明学生进入教室的状态。
,and sat down to have their lessons
sat是简单的动词过去式。学生进入教室,然后坐下来上课。