时态怎么选1.by the middle of the 1920s the farthest corners of the earth _______ explored.A have been B had been 为什么不是用A更好吗?还有影响.2.after world war 2,mass immigration _____ Australia into a modern nation.has transformen
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![时态怎么选1.by the middle of the 1920s the farthest corners of the earth _______ explored.A have been B had been 为什么不是用A更好吗?还有影响.2.after world war 2,mass immigration _____ Australia into a modern nation.has transformen](/uploads/image/z/7187132-20-2.jpg?t=%E6%97%B6%E6%80%81%E6%80%8E%E4%B9%88%E9%80%891.by+the+middle+of+the+1920s+the+farthest+corners+of+the+earth+_______+explored.A+have+been+B+had+been+%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AF%E7%94%A8A%E6%9B%B4%E5%A5%BD%E5%90%97%3F%E8%BF%98%E6%9C%89%E5%BD%B1%E5%93%8D.2.after+world+war+2%2Cmass+immigration+_____+Australia+into+a+modern+nation.has+transformen)
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