______ no doubt that 100 years ago animal testing was cruel but today animals in experiments are ve...
2023-02-09 08:56:32 11次 辽宁省沈阳二中2010-2011学年上学期高三阶段测试二 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
______ no doubt that 100
years ago animal testing was cruel but today animals in experiments are very
well taken care of．
A．It is B．There is C．This isD．That is
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