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_____ is estimated is that 300 million farmers will become urban dwellers in three decades.
A.ItB.AsC.ThatD.What
D
考查主语从句。What is estimated是一个主语从句,what引导起这个主语从句,并在句中做主语。AB不能引导主语从句,C在主语从句中不充当任何成分。
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