题目内容
19．The number of the tigers becoming smaller and smaller because a number of them been killed by the human beings．（ ）| A． | are； have | B． | are； has | C． | is； have | D． | is； has |
分析 老虎的数量变得越来越小了，因为他们中的许多被人类杀害了．
解答 答案：C．
根据The number of the tigers--，可知the number of表示"…的数量"，跟复数名词连用作主语时，中心词是number，谓语动词要用单数，所以第一个空应该用is；再根据because a number of them been killed by the human beings，可知 a number of表示"许多"，相当于 many，修饰可数名词复数，作主语时，谓语动词用复数，所以第二个空用have．故选C．
点评 做本题的关键是熟练掌握the number of 与a number of 的区别．
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