12.I haven't finished my composition.I ______ for two hours and a half.A.have written it B.have been writing itC.wrote it D.am writting it为什么?A为什么不行,A不是现在完成时?现在完成时表示一个动作从过去发生持续到将
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![12.I haven't finished my composition.I ______ for two hours and a half.A.have written it B.have been writing itC.wrote it D.am writting it为什么?A为什么不行,A不是现在完成时?现在完成时表示一个动作从过去发生持续到将](/uploads/image/z/13512036-12-6.jpg?t=12.I+haven%27t+finished+my+composition.I+______+for+two+hours+and+a+half.A.have+written+it+B.have+been+writing+itC.wrote+it+D.am+writting+it%E4%B8%BA%E4%BB%80%E4%B9%88%3FA%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E8%A1%8C%2CA%E4%B8%8D%E6%98%AF%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%3F%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%E8%A1%A8%E7%A4%BA%E4%B8%80%E4%B8%AA%E5%8A%A8%E4%BD%9C%E4%BB%8E%E8%BF%87%E5%8E%BB%E5%8F%91%E7%94%9F%E6%8C%81%E7%BB%AD%E5%88%B0%E5%B0%86)
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