题目内容
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
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题目内容
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