_____ is estimated is that 300 million farmers will become urban dwellers in th
题型：不详难度：来源：
| _____ is estimated is that 300 million farmers will become urban dwellers in three decades. |
答案
| 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。 |
举一反三
| ____ surprised me most was to see so many women crying sadly there. |
It’s not necessary to explain the truth ____ there is spring wind, there is green grass.| A．which wherever | B．that which | C．which when | D．that wherever |
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________wants to stay in a hotel has to pay their own way.| A．Anyone | B．The one | C．Whoever | D．Who |
|
is not yet decided.| A．Whether he will write the book | B．Whether will he write the book | | C．If he will write the book | D．If will he write the book |
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| It is still unknown_______ caused the accident last Saturday. |
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