I’ll go to the library as soon as I finish what I .A. was doingB. am doingC. have doneD.

问题补充：

I’ll go to the library as soon as I finish what I .

A. was doing

B. am doing

C. have done

D. had been doing

答案：

A. was doing

(答案→)B. am doing

C. have done

D. had been doing

解析：句意：我一完成手边的工作就去图书馆。表示现在正在做的事情，故用现在进行时，选B。