17．The highway from Zunyi to Renhuai_____for about two years．（　�。�
A．has openedB．has been openC．has been opened

分析 從遵義到仁懷的高速公路已經(jīng)開通兩年了．

解答 答案：B．考查現(xiàn)在完成時態(tài)．句意"從遵義到仁懷的高速公路已經(jīng)開通兩年了．"．for+段時間，通常用于現(xiàn)在完成時態(tài)，結(jié)構(gòu)是have/has+done．主語highway單數(shù)，因此用has．highway是動作open開通的承受者，因此用現(xiàn)在完成時態(tài)的被動語態(tài)．open非延續(xù)性動詞，現(xiàn)在完成時態(tài)，用be open，這里的open是形容詞，表示開通的狀態(tài)．be的過去分詞是been．因此用has been open，答案是B．

點評 現(xiàn)在完成時態(tài)，由"have/has+過去分詞"構(gòu)成，表示動作發(fā)生在過去，但與現(xiàn)在的情況有聯(lián)系．也表示從過去某一時間開始一直延續(xù)到現(xiàn)在并還可能繼續(xù)延續(xù)下去的動作．結(jié)合語境，注意人稱變化及動詞過去分詞變化．

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