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When she heard the doorbell (ring),she rushed to the door适当形

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When she heard the doorbell (ring),she rushed to the door适当形式
When she heard the doorbell (ring),she rushed to the door适当形
When she heard the doorbell ring,she rushed to the door.
再问: 为什么?
再答: 语法描述:跟在 hear 后的非谓语动词不定式可省略 to 实际应用:现实生活中的表达方式
再问: This kind of book is very popular. It (sell) out in an hour适当形式
再答: It‘ll be sold out in an hour.