Bihar is
poorest state, with an annual per capita income of $111, lower than in
the most impoverished countries of the world.
A lower
than in
B
lower than that of (correct)
C
and lower than that of
D
which is lower than in
it有明确的指代对象。文中的两个比较对象是“an annual per capita income of $111”和“the most impoverished countries of the world的income水平”。所以it出现即可以指代111,又可以指代“the most impoverished countries of the world的income水平”,有歧义。
1,比较考点的代词都用that或those
2,b这个选项简洁
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