While dancing happily at home,_______________ ．A．the door bell rangB．the door be

题干

While dancing happily at home,_______________ ．

A．the door bell rang	B．the door bell rings
C．we heard the door bell rings	D．we heard the door bell ring

上一题下一题 0.64难度单项选择更新时间:2011-12-19 11:19:51

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