While dancing happily at home,________.[
题型:选择题
问题:
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
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