If I could help I needn’t have taken trouble to send the broken computer to the repairing

问题补充：

If I could help,I needn’t have taken trouble to send the broken computer to the repairing centre.

A. myself

B. it

C. that

D. this

答案：

A. myself

(答案→)B. it

C. that

D. this

解析：it可做形式宾语代指一种模糊的概念。