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Over the past ten years cultivated sunflowers have become a major commercial crop, second only to soybeans as a source of vegetable oil.
A.second only to soybeans as a source of vegetable oil
B.second in importance to soybeans only as a source of vegetable oil
C.being second in importance only to soybeans as a source of vegetable oil
D.which, as a source of vegetable oil, is only second to soybeans
E.as a source of vegetable oil only second to soybeans
答案是A
求大神解释一下A和E的区别!十分感谢!
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