All the students _____ by 10:30, but the speaker _____ until 11:00.[ ]

A. return, has turn up

B. has returned, turned up

C. returned, turn up

D. had returned, didn't turn up

《格列佛游记》是斯威夫特极具讽刺色彩的小说，请概括写出其中两个讽刺性的故事情节。