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After two years' research ,we now have a ________ better und

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After two years' research ,we now have a ________ better understanding of the disease.
A.very B.far C.fairly D.quite
After two years' research ,we now have a ________ better und
这是考察比较级的修饰语,在四个选项中只有far可以用来修饰比较级.
可以修饰比较级的词,much,a lot,far,by far,a great deal,rather,many,any,…的多
a little,a bit,…一点儿 even甚至,still仍然.
所以,答案是B.