20. I don’t doubt　　　 he will come tomorrow, but I do doubt　　　 he will come on time.

A. that; that　　 　　　　 B. that; whether　　 　　 C. whether; whether 　　 D. whether; that

19. Only when the Second World War ended ______ to his hometown.

A. he returned　　　　　　B. he had returned　　 C. had he returned　　　　　　D. did he return