_____ is estimated is that 300 million farmers will become urban dwellers in three decades.
A．ItB．AsC．ThatD．What
D
考查主語從句。What is estimated是一個主語從句，what引導(dǎo)起這個主語從句，并在句中做主語。AB不能引導(dǎo)主語從句，C在主語從句中不充當(dāng)任何成分。
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