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_____ is estimated is that 300 million ...

 _____ is estimated is that 300 million farmers will become urban dwellers in three decades.

A.It

B.As

C.That

D.What

 

D 【解析】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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