---Whydidn’tyougotoplayfootballwithusyesterdayafternoon...

问题详情：

---Why didn’t you go to play football with us yesterday afternoon?

  ----I _____my mother with housework then.

           A. help  B. was helping  C. had helped  D. have been helping

【回答】

B

知识点：动词时态

题型：选择题