I found not very difficult to keep away from the A/H1N1 Flu.A. that　B. thisC. oneD. it

问题补充：

I found not very difficult to keep away from the A/H1N1 Flu.

A. that

B. this

C. one

D. it

答案：

A. that

B. this

C. one

(答案→)D. it

解析：find it +形容词+to do sth 句型，“发现做某事怎么样”,it用来代替后面不定式的内容,不能用指示代词、不定代词one。