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
由句子結(jié)構(gòu)上看，前后的動作執(zhí)行者應(yīng)該一致，所以排除A和B。C想是個賓語從句，要注意時態(tài)一致，如果將rings改成rang才可以。
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