tpo10听力鲸鱼

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7 According to the professor, what three aspects of the Ambulocetus fossil make Ambulocetus a likely bridge between mammals and sea mammal? (3 answers)
A. It had an elongated skeletal structure.  
B. It strongly resembled a modern hippopotamus.
C. It had an unusually long and thin tail for a whale.  
D. It had limbs that could have been used for walking.  
E. Its skull had ear bones characteristic of land mammals.  
解析        It clearly had four limbs that couldn’t have been used for walking?即答案D
这个不对呀，和原文意思相反呢，怎么回事