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

解析試題分析： be limited to局限于，to 為介詞，故接動名詞，rather than 后接動詞原形，故選A。句意：研究者只局限于生產(chǎn)利潤而不是確保轉(zhuǎn)基因食品的安全性。
考點：介詞to 及rather than 的用法。
點評：要熟記語法規(guī)則：介詞to后接名詞，代詞，或動名詞，rather than 后接動詞原形，另外prefer to do sth rather than do sth也是�？冀Y構

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