给下列单词归类(同一类的单词写在同一个苹果内,只写序号)。
This old woman _____ have food. A. did B. didn’tC. don’t
When did they _____ ? A. comeB. cameC. comes
What _____ to you? A. happenB. matterC. happened
What did you _____ ? A. sawB. seeC. bought
I usually_____ to the zoo at the weekend. A. wentB. goC. came