53 Britain's economic growth was slower in the mid-1970's and its decline much more rapid in the subsequent recession than the United States. (A) Britain's economic growth was slower in the mid-1970's and its decline much more rapid in the subsequent recession than the United States. (B) The economic growth of Britain was slower in the mid-1970's and it declined much more rapidly in the subsequent recession than the United States did. (C) Britain's economy, which grew more slowly in the mid-1970's, also had declined much more rapidly in the subsequent recession than the United States did. (D) The economy of Britain grew more slowly in the mid-1970's and declined much more rapidly in the subsequent recession than did the economy of the United States. (E) Britain's economy grew more slowly in the mid-1970's and its decline was much more rapid during the subsequent recession than the economy of the United States. 标准答案为D,但是D的 did the economy of the United States,did无法同时还原 grew 和declined两个动词。E答案的解释是因为使用太多名词,不如D的动词有效。莫非动词有效原则由于助动词还原原则??
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