题目内容

The Smiths ______ their breakfast when the doorbell rang.
A．hadB．has been havingC．are havingD．were having
D
句意“史密斯一家正在吃早餐，就在这时门铃响了”。主语The Smiths为复数，主谓要一致，谓语也要用复数形式。
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