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：这四个副词中，通常只有far可用于修饰比较。注：quite有时也可用于修饰比较better，但它只用于表示“身体康复”，不用于其他意义。