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Corn originated in the New World and thus was not known in Europe until Colum...

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发表于 2017-2-18 17:00:41 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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Corn originated in the New World and thus was not known in Europe until Columbus found it ________ in Cuba.
A.being cultivated                 B.having cultivated
C.been cultivated                         D.cultivating
3.Who would you rather _______ with you, George or me﹖
A.going                B.to go     
C.have gone                D.went
4.Water is _______ to the growth of crops.
A.absolute         B.special      
C.moderate                 D.essential
5.You ______ all those calculations ! We have a computer to do that sort of thing.
A.needn't have done                         B.must not have done
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