the students are (talking and laughing happily).对划线（括号）部分提问急！！

the students are (talking and laughing happily).对划线（括号）部分提问急！！
the students are (talking and laughing happily).对划线（括号）部分提问
急！！

the students are (talking and laughing happily).对划线（括号）部分提问急！！
What are students doing?
不懂再问

What are the students doing

What are the students doing?