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【题目】---How long has the factory _______?

---Since three years ago.

A. open B. be open

C. been open D. been opened

【答案】C

【解析】句意:--这个工厂已经开始多长时间了?--自从三年之前。 根据上文是How long提问的是表示状态的,所以用表示状态的形容词be open;根据语境可知用现在完成时。根据题意故选C。

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