While watching television, ____.
#96009
A
the doorbell rang
B
we heard the doorbell ring
C
there was someone knocking at the door
D
the doorbell was ringing
推荐题目
Before going abroad he devoted all he could _______ his oral English.
#97453
A
improve
B
to improve
C
improving
D
to improving
Tom pretended________it, but in fact, he knew it very well.
#91930
A
not listen to
B
not to hear about
C
not to have heard about
D
to be not listening to
I can’t go out with these clothes_____ 
#94805
A
wash
B
washing
C
to wash
D
washed