It hasn’t been ______ that food from cloned animals is really safe for humans to eat. A. confirmed B...
2022-10-24 21:09:50 40次 2014-2015学年江苏如皋中学高二上学期10月阶段练习英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It hasn’t been ______ that food from cloned animals is really safe for humans to eat.
A. confirmed B. considered
C. turned out D. proved
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