While I _____________, someone ___________at the door.
A.did my homework; knocked |
B.do my homework; knocks |
C.was doing my homework; knocked |
D.was doing my homework; knocks |
While I _____________, someone ___________at the door.
A.did my homework; knocked |
B.do my homework; knocks |
C.was doing my homework; knocked |
D.was doing my homework; knocks |