I found difficult to work out the problem without a computer.A. thatB. itC. thisD. myself

问题补充：

I found difficult to work out the problem without a computer.

A. that

B. it

C. this

D. myself

答案：

A. that

(答案→)B. it

C. this

D. myself

解析：find +it+adj +to do sth，故选B其中it作形式宾语，真正的宾语是动词不定式。