题目内容
2.According to new scientific assessments,two thirds of carbon dioxide ____ from the United States and Western European countries.( )A. | have come | B. | has come | C. | having come | D. | coming |
分析 根据新的科学评估,三分之二的二氧化碳来自美国和西方欧洲国家.
解答 答案是B.本题考查主谓一致;题干中缺少的是谓语动词,故排除C和D;"分数+名词"做主语,谓语动词的单复数取决于名词,名词不可数时谓语动词用单数,名词是可数名词复数形式时谓语动词用复数;题干中的 carbon dioxide 不可数,故谓语动词用单数,排除A;故答案是B.
点评 积累常见主谓一致的规则,找准主语,结合语境合理判断.
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