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

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

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

What did you see when you___to the park?A.will walk B.is walking C.are walking D.were walking
D
其它选项和主句时态不一致.主句是一般过去时

D
用过去进行时与主句的过去式对应。

d 过去进行时
前面都用did了

D

D,
很明显的过去式