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    精英家教网 > 高中英语 > 题目详情
    It is thought that one billion people I the world,  _____is half the word’s workers, earn their living by farming.
    A．ifB．thatC．whichD．what
    B
    句中“half the world’s workers”是对“one billion people in the world” 的补充说明， “that is”是 “that is to say”的省略说法，是插入语，that 并不是引导非限制性定语从句的，如果在 “that is”后加个逗号则更清楚，应选B。
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