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While dancing happily at home,_______________ .
A.the door bell rangB.the door bell rings
C.we heard the door bell ringsD.we heard the door bell ring
D
由句子结构上看,前后的动作执行者应该一致,所以排除A和B。C想是个宾语从句,要注意时态一致,如果将rings改成rang才可以。
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