Jack,___you enjoy your summer camp?Yes.I knew a lot of new friends .A,do B,did C,were

问题描述:

Jack,___you enjoy your summer camp?Yes.I knew a lot of new friends .A,do B,did C,were

回答的句子使用的动词是knew,
所以:问句时态是一般过去式,
选择:B:did