People used to think that the surface of the moon was smooth, ______
A: don't they
B: wasn't it
C: didn't they
D: usedn't they
A: don't they
B: wasn't it
C: didn't they
D: usedn't they
举一反三
- There used to be a small school,___________ A: was there B: wasn’t it C: usedn’t there D: usedn’t it
- Peter used to live in London, ______ A: usedn’t he B: B. wasn’t he C: didn’t he use D: didn’t he use to
- There used to be a cinema here, __________? A: usedn’t it B: didn’t there C: didn’t it D: used it
- There used to be a cherry tree in this field, ______ A: usedn't it B: usen't it C: didn't it there D: usedn't there
- There used to be petrol station near the park, ______ A: didn't it B: doesn't there C: usedn't it D: didn't there