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20. She’ll never forget her stay there ________ she found her son who had gone missing two years before.

A. that　　 B. which　 C. where　　　 D. when

19. My uncle’s house in the downtown area is much smaller than ours , but it is twice _______ expensive .

A. as　　　　 B. so　　 C. too　　　 D. very

18. -You speak very good French !

-Thanks . I __________ French in Sichuan University for four years.

A. studied　　 B. study　 C. was studying　　　 D. had studied

17. The teacher together with the students ________ discussing Reading Skills that ________ newly published in America .

A. are ; were　　　 B. is ; were　　 C. are ; was　　　　 D. is ; was

16. Not until I came home last night ________ to bed .

A. Mum did go　　　 B. did Mum go　　　 C. went Mum　　　 D. Mum went

15. -Why don’t we choose that road to save time ?

-The bridge to it __________ .

A. has repaired　　　　　 B. is repaired　　

C. is being repaired　　　 D. will be repaired