【題目】---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：--這個工廠已經(jīng)開始多長時間了？--自從三年之前。 根據(jù)上文是How long提問的是表示狀態(tài)的，所以用表示狀態(tài)的形容詞be open；根據(jù)語境可知用現(xiàn)在完成時。根據(jù)題意故選C。

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