If only I＿＿＿＿＿how to operate a computer as you do! A. had knownB. wou欤?know C. should know

问题补充：

If only I＿＿＿＿＿how to operate a computer as you do!

A. had known

B. wou欤?know

C. should know

D. knew

答案：

A. had known

B. wou欤?know

C. should know

(答案→)D. knew

解析：在if only引导的感叹句中，谓语动词的形式与wish后宾语从句中谓语动词的形式一样。