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

发布时间：2020-08-16 21:49:08

     is estimated is that 300 million farmers will bee urban dwellers in three decades.
A. It
B. As
C. That
D. What

网友回答

A. It
B. As
C. That
(答案→)D. What
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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