While dancing happily at home,_______________ ．A．the door bell rangB．the door be
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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 |
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答案
| D |
解析
| 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。 |
举一反三
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