The population of India has been steadily increasing for decades, and it will probably have what is estimated as 1.6 billion people by 2050 and surpass China as the world's most populous nation.
it will probably have what is estimated as
they are likely to have
the country will probably have
there will probably be
there will be an estimated
A it指代对象错误,在本选项中it指代population,应指India;what is estimated as与probably重复
B they没有指代对象
C 正确,句子and后面的surpass China, 决定此处用 the country 最合理
DE there be结构无法与未划线部分句子的and surpass连接。
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