--- Is there a primary school in your village now? --- No but there .
A. used
B. did
C. used to
D. used to be
网友回答
A. used
B. did
C. used to
(答案→)D. used to be
解析：考查省略。used to do过去做。there used to be = there used to be a primary school。句意：现在你们村那儿有一所小学吗？——没有，但那儿过去有。