一、单项选择
1.Nothing he had done turned out to be useful, _______________?
A.did it B.had he
C.hadn’t he D.didn’t it
2.—I spend two weeks in Beijing last year.
—Then you must have visited the Great Wall during your stay, ________ you?
A.mustn’t B.didn’t
C.haven’t D.hadn’t
3.There is little doubt in your mind that he is innocent, _______?
A.is there B.isn’t there C.is he D.isn’t he
4.Mrs. Green doesn’t believe that her son is able to design automobiles, ?
A.is she B.isn’t she C.doesn’t she D.does she