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13．電視機已經開了幾個小時了．請把它關掉，好嗎？
The TV sethas been on for several hours．Would you please turn it off？

分析 has been on for several hours

解答答案：has been on for several hours
根據給出的漢語句子，結合英語的翻譯，經過對照后發現英語句子中缺少"已經開了幾個小時了"的表達，其中"幾個小時"的英文表達為"for several hours"結合漢語句子中關鍵詞"已經"以及該表示一段時間的時間狀語，是現在完成時的標志詞，表示從過去某一時間開始一直延續到現在并還可能繼續延續下去的動作，此時的動詞必須要用于延續性動詞，所以在本句中"開"的英文表達為延續性動詞短語"be on"，現在完成時的結構為have/has+動詞的過去分詞，主語為The TV set是第三人稱單數，故用has，be 的過去分詞為been，故答案為has been on for several hours

點評做類似題首先讀漢語句子了解要表達的意思，然后跳過空格再讀一下所給的英語部分從而分析出要求翻譯的英語，最后填入正確答案并檢查，在本題中注意用現在完成時其結構為have/has+動詞的過去分詞，如句中帶有表示一段時間的時間狀語時此時的動詞必須要用于延續性動詞把握這兩點是答題的關鍵

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