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It is thought that one billion peop
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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
参考答案:
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
参考答案: