It is thought that one billion people in the world,_____ is half the world’s workers, earn their living by farming.
A．ifB．thatC．whichD．what
B
句中“half the world’s workers”是對(duì)“one billion people in the world”的補(bǔ)充說(shuō)明�！皌hat is”是“that is to say”的省略說(shuō)法
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