题目内容
While watching television, __________.
[ ]
A.the doorbell rang
B.we heard the doorbell ring
C.there was someone knocking at the door
D.the doorbell was ringing
答案:B
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题目内容
While watching television, __________.
A.the doorbell rang
B.we heard the doorbell ring
C.there was someone knocking at the door
D.the doorbell was ringing