问题
选择题
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
答案
答案：D
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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
答案：D