WHAT ... WHEN HE... TO YOUR HOUSE YESTERDAY

41. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

41. What ... when he... to your house yesterday?

a. was you doing / comes

b. were you doing / came

c. did you do / came

d. do you do / comes

 b