[求助]00-5-24的疑问

cqxf

24.Dolphins are sleek and powerful swimmers that found in all seas and unlike porpoises, have

                                             

well-defined beaklike snouts and conical teeth.

答案是B。但是我觉得那个HAVE 及C选项也有问题也，前面已经是完整句了，怎么还可以用have 而不是用having了。

[此贴子已经被作者于2005-5-8 18:36:41编辑过]

consonant

that found in all seas and 的这个and 连什么？

have and are found   parallel

happytoni

省略句