I heard him _____ the door.

.When I passed by his door,I heard him _____________. I have never heard of him,_____ ? I heard someone _____(knock /knocking) at the door just now i was watching tv when i heard the door(knocking) Just at that time,I heard someone____at the door .When I passed by his door,I heard him _____________.A、singB I heard someone___the door and___ I heard him sing in the classroom改为被动语态? was it 8 o'clock _____you heard someone _____ at the door? One evening he heard the door _____ at and found a traveler when he heard a knock at the door ,he went _____ quickly according the dictionary,I heard him leave=he was heard to l