题目内容：

Did Tom _ his homework yesterday?空格里是什么呀?
Did Tom —- his homework yesterday?空格里是什么呀?

优质解答

Did是过去式,很显然这个句子是个过去式,问的是:汤母昨天做了他的家庭作业么?Did是助动词,所以空格那应该添动词,do homework是个短语,前面有Did了,所以要用动词原形,所以填do