"Did you know if he has\had finish his work?"一句中应是if he has还

"Did you know if he has\had finish his work?"一句中应是if he has还 He has to finish his work,so--- --- he has 承认 that he did not finish his homework H say he has already (finish)his work He has to finish his work,so--- I if one has no interest in his work or study ,__ can he do we has he finished the work (用did you know联成一句话) I don't know if he has a …… he has left for the airport.,if you had come here ten minute --You know mike has been ill for days.--yes,I wonder if he i if he has time,he must come He has his work.A.finished do B.finished done C.to finish do