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

—I _____my mother with the housework then.

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

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

—I _____my mother with the housework then.

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

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

—I _____my mother with the housework then.

1. A.
   helped
2. B.
   was helping
3. C.
   had helped
4. D.
   have been helping