单选题Scientistswillhaveto________new

单选题 Scientists will have to ________ new methods of increasing the world's food supply.A.come upB.come up withC.come overD.come across

B解析come up with…提出……；come up走过来／（指某事）发生，如：Call me if anything comes up．C项中over为副词，表示“过来”，相当于up；D项意思为“偶然遇见”．

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