19．The Shanghai Expo            for 60days so far．（　�。�
A．opensB．has openedC．has been openedD．has been open

分析 上海世博會(huì)到目前為止已經(jīng)開展六十天了．

解答 答案：D 根據(jù)for 60 days 可知，這是一個(gè)表示一段時(shí)間的時(shí)間狀語，而open是瞬間性動(dòng)詞，不能持續(xù)一段時(shí)間，所以要用be open （延續(xù)性動(dòng)詞be+形容詞open），它后面可以跟表示一段時(shí)間的狀語；又因?yàn)殛P(guān)鍵詞so far可知用現(xiàn)在完成時(shí)，現(xiàn)在完成時(shí)態(tài)的結(jié)構(gòu)為have/has+動(dòng)詞的過去分詞，主語是The Shanghai Expo，所以助動(dòng)詞用has，故選D．

點(diǎn)評(píng) 本題要注意open的詞性，它既可以是動(dòng)詞還能當(dāng)形容詞．

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