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
I’ve never seen a Shakespeare’s play __________ so wonderfully. 
#97272
A
performing
B
performed
C
perform
D
is performing
The kangaroo was lucky. It just missed      .
#91511
A
catching
B
to be caught
C
to catch
D
being caught
Holmes and Watson spent the night ___in the lady’s room .
#96056
A
being locked
B
locking
C
locked
D
lock