1 but 和 however 两个,只要用一个就行了.
2 这里是名词用作形容词,都不需要用复数.
意思是：关于改基因蔬菜的有害作用的说法,更多的是推测,而不是有记载的事实.
3 过去完成时的意思,是指北美大陆的西部在伸展的时候,Santa Catulina Mountains 就已经形成了.
而一般过去时（被动态）的意思,是指北美大陆的西部在伸展的时候,Santa Catulina Mountains 就正好在那个时候形成的.
俺的感觉是应该选B,而不是A
几道SAT语法题求解Some philosophers maintain that language is essent
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