The mother with her son at home that snowy night.A. were; atB. was; atC. were; onD. was;

问题补充：

The mother with her son at home that snowy night.

A. were; at

B. was; at

C. were; on

D. was; on

答案：

A. were; at

B. was; at

C. were; on

(答案→)D. was; on

解析：

第一空考查主谓一致，主语是：The mother with her son，with连接两个主语，谓语和前面的主语一致，所以填was，第二空考查介词的用法，在具体的早晨、下午、晚上都用on。所以填D。