There is no doubt _____ 100 years ago animal testing was cruel but today animals in experiments are ...
2022-12-28 02:51:59 133次 2012年北师大版高中英语选修一Unit13练习卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
There is no doubt _____ 100 years ago animal testing was cruel but today
animals in experiments are very well taken care of.
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A．whether
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B．that
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C．where
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D．which
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本题链接：
