There many restaurants in town but they eat the food there at first.A. used to have did

问题补充：

There many restaurants in town, but they eat the food there at first.

A. used to have, didn’t use to

B. used to have, didn’t used to

C. used to be, didn’t use to

D. used to be, didn’t used to

答案：

A. used to have, didn’t use to

B. used to have, didn’t used to

(答案→)C. used to be, didn’t use to

D. used to be, didn’t used to

解析：第一空是there be 的句型，不可能出现have，排除A、B。Used to do 的否定式是D选项而不是C。