20.　 -----He should have been warned of the danger.

------_______, but he wouldn’t listen to me .

A. So he had　　　 　B. So had he　 　C. So was he　　　 D. So he was

19. The win in the 100-meter butterfly gave the American swimmer Michael Phelps eight gold medals in Beijing, ________ the record set by American legend Mark Spitz at the 1972 Munich Games.

A. broken　　　　　 B. to break　　　　 C. breaking　　　 　D. being broken