What did you see when you___to the park?A.will walk B.is walking C.are walking D.were walking

问题描述:

What did you see when you___to the park?A.will walk B.is walking C.are walking D.were walking

d 过去进行时
前面都用did了

D

D,
很明显的过去式

D
用过去进行时与主句的过去式对应。

D
其它选项和主句时态不一致.主句是一般过去时