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104. El Nino, the periodic abnormal warming of the sea surface off Peru, a phenomenon in which changes in the ocean and atmosphere combine allowing the warm water that has accumulated in the western Pacific to flow back to the east.
(C) a phenomenon in which ocean and atmosphere changes combine and which allows the warm water that is accumulated
(D) is a phenomenon in which changes in the ocean and atmosphere combine to allow the warm water that has accumulated
正确答案D没有疑问。
只是选项C中出现的定语从句的并列,a phenomenon in which ... and which ... ,总觉得第二个which前面少了一个in。不知道这种结构能不能这么省略?
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