北京先知文化中心2011屆高三模擬測(cè)試試題

Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe to eat. 

A. whether             B. that                C. what             D. how

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北京先知文化中心2011屆高三模擬測(cè)試試題

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