Most fishes and many reptiles have ribs along most of the spine, but in mammals finding them only in the chest area.

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问题 Most fishes and many reptiles have ribs along most of the spine, but in mammals finding them only in the chest area.

选项 A、they find
B、which they find
C、they are found
D、which they are found

答案C

解析 本题前后两句为but连接的两个并列分句,根据句意可知,画线处可用they代替前面的fibs,谓语和主语是被动关系,所以C项正确。
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