I _________ （watch) TV when someone knocked at the door．

When you ______ at the door, I ______ some washing.A、knocked; didB、was knowcking; didC、k

I was about to fall asleep______there was a knock at the door.A．asB．whileC．thenD．when

While I _____ television, the door bell _____.A. watched／would ringB. would watch／h

She _____ go to bed when someone knocked at the door .A.was about toB.is about toC.was

I was just lying down when I heard someone ______ on the window.A.breakB.tryC.hitD.knock

No sooner had he sat down to lunch ______. there was a knock at the door.A.whenB.thatC.asD