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题型:单项选择 难度:0.85 引用次数:922 题号:316217
____________ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.
A.It isB.There isC.This isD.That is
9-10高二·西藏拉萨·阶段练习 查看更多[1]
【知识点】 固定句型

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