It is thought that one billion people I the world, _ is half the word’s worke
题型：不详难度：来源：
| It is thought that one billion people I the world, _ is half the word’s workers, earn their living by farming. |
答案
| B |
解析
| 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B。 |
举一反三
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