Riding on the swings and playing with the ducks in the pond our children’s greatest pleasures when we took them to the park.
A. is
B. were
C. was
D. are
网友回答
A. is
(答案→)B. were
C. was
D. are
解析：考查主谓一致：句意：当我们带他们去公园的时候，荡秋千和在池塘玩鸭子是孩子们主要的乐趣。这句话的主语是两个动名词，所以谓语用复数，时间状语是when we took them to the park.所以用一般过去式，选B。