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    精英家教网 > 高中英语 > 题目详情
    Research has been limited to ____ production profits, rather than ____ that GM foods are safe.
    A．increasing; make sureB．increasing; making sure
    C．increase; make sureD．increase; making sure
    B

    试题分析： be limited to局限于，to 为介词，故接动名词，rather than 后接动词原形，故选A。句意：研究者只局限于生产利润而不是确保转基因食品的安全性。
    点评：要熟记语法规则：介词to后接名词，代词，或动名词，rather than 后接动词原形，另外prefer to do sth rather than do sth也是常考结构
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