____________ 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
B
考查句型：There is no doubt that 毫無疑問做某事，句意：毫無疑問一百年前動物檢測很殘忍但是今天在試驗中的動物們被非常很好的照顧。所以選B。
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