83. In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing many more prescriptions for higher-cost drugs. (A) a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing (B) a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing (C) a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written (D) which occurred not just because drugs are becoming more expensive but doctors are also writing (E) which occurred not just because of more expensive drugs but because doctors have also written 答案是B。我想请问下,这个句子的结构是什么呀?第二个分句是同位语从句。在整个句子中充当什么成分呢?状语?修饰前面一个分句的同位语从句? -- by 会员 uniquenellie (2011/1/12 20:46:19)
修饰前一个的同位语从句
a phenomenon修饰的是the increase ...
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