There used to be a small school ?A. was there B. wasn’t it C. usedn’t thereD. usedn’t it

问题补充：

There used to be a small school, ?

A. was there

B. wasn’t it

C. usedn’t there

D. usedn’t it

答案：

A. was there

B. wasn’t it

(答案→)C. usedn’t there

D. usedn’t it

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