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give up give off give back give away
ought to have told should tell should have been told ought to be told
easy easily easier more easily
农业灌溉的需要 旅游观光的需要 商品运输的需要 借助水力驱动机器设备的需要
anything everything nothing something
Either Nothing Neither None
mustn’t won’t needn’t might not
however whichever whatever wherever
A.he arrives he arrived will he arrive did he arrive
科技为政治服务的战略 以“大科技”发展为主的战略 调整和重建中发展阶段 科技为经济发展服务的战略
except for except that except besides
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would take did take had taken would have taken
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