After two years’ research we now have a better understanding of the disease.A. veryB. f

问题补充：

After two years’ research, we now have a better understanding of the disease.

A. very

B. far

C. fairly

D. quite

答案：

A. very

(答案→)B. far

C. fairly

D. quite

解析：:far用于修饰比较级、最高级,表示数量、程度等,意为“……得多，尤其，更”。very 意为“非常”,只修饰形容词或副词的原级,不修饰形容词或副词的比较级。fairly 意为“适当,相当”,只修饰形容词或副词的原级,不修饰形容词或副词的比较级。quite 意为“完全,十分,彻底,真正,的确”,只修饰形容词或副词的原级,不修饰形容词或副词的比较级。