A. chatting and laughing B. chatted and laughed C. was chatting and laughing D. was chatted and laughed
单项选择题Not until the bell had rung（）the classroom in a hurry.
A. he came into B. did he come into C. he has come into D. has he come into
单项选择题At the party, everybody congratulated the scientist（）winning the award after his years of hard work.
A. to B. on C. at D. about
