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Pumpkins are believed to have originated in North America,__

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Pumpkins are believed to have originated in North America,______ seeds from related plants have been found dating back to 7000 B.C.
A.as B.which C.where D.whose
我觉得D也说得通啊,他去修饰pumpkins,表示前面pumpkins的物主代词为什么?
还是C好些.where=in which,修饰North America.D修饰Pumpkins虽然语法上也能说的通,但句意不太好,体现不了这些种子是在North America发现的.而用C则能表明这一点.因为单项都是选最佳答案,所以还是C好些.