I saw an old man and the dog________(正在街上散步的) 填什么?

问题描述:

I saw an old man and the dog________(正在街上散步的) 填什么?
I saw an old man and the dog _____(正在街上散步的)on the road

填 that were walking.定语从句的先行词是the old man and the dog,有人又有物,关系代词要用that;主句的谓语是过去式saw,定语从句的谓语动词用过去进行时were walking.

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