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”是對“one billion people in the world” 的補充說明， “that is”是 “that is to say”的省略說法，是插入語，that 并不是引導非限制性定語從句的，如果在 “that is”后加個逗號則更清楚，應(yīng)選B。
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