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—What do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ som...
题目内容：
—What do you think of genetically modified food (转基因食品)?
—We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.
A. that, for B. it, for C. it, of D. that, of
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