We used to every day when we were children.A. swimB. swimmingC. be swimmingD. going swimmi

问题补充：

We used to every day when we were children.

A. swim

B. swimming

C. be swimming

D. going swimming

答案：

(答案→)A. swim

B. swimming

C. be swimming

D. going swimming

解析：句意：当我们是孩子的时候，我们过、每天都去游泳。used to + v过去常常做某事，used to后跟动词原形，表示过去一段时间内习惯性的动作或状态，仅用于一般过去时。Be used to v-ing习惯于，to后跟动词ing形式，可用于各种时态。故选A。