When the teacher came into the classroom, the students stopped ______.

[    ]

　　A. talking   B. talk   C. to talk   D. talked

When the teacher came into the classroom, the students stopped

______.

[　　]

A. talking　　B. to talk　　C. talk　　D. talked

 When the teacher came into the classroom, the students ____________ at once.

A. stopped  talking B. stopped to talk C. to stop talking  D. to stop to talk

When the teacher came into the classroom, the students          .