Scott found difficult to solve the problem.A. itsB. it’sC. its’D. it was

问题补充：

Scott found difficult to solve the problem.

A. its

B. it’s

C. its’

D. it was

答案：

A. its

B. it’s

C. its’

(答案→)D. it was

解析：本题动词found后跟的是一个宾语从句，宾语从句中主语是动词短语，用了形式主语it来代替，真正主语位于句尾，用to do，主句动词时过去式，从句动词be亦应该用过去式，故选D。