The students entered the classroom,smiling and____,and___down to have their lessons
问题描述：
The students entered the classroom,smiling and____,and___down to have their lessons
Atalked ,sat B.talking,sitting Ctalking sat Dtalked ,sitting
答
选c.应为sat 是和entered 并列的并列是什么意思，那么不应该全都是ING形式吗smiling 和talking 是并列的，但是sat 是和前面的entered 并列滴