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
网友回答
A. was doing
(答案→)B. am doing
C. have done
D. had been doing
解析：考查时态题。as soon as 后的从句用的是现在时态，排除AD，finish后的宾语从句是用现在时态，排除C。B项表示手头正在做（还没完成的）。句子意思：一完成我正在做的工作，我就会去图书馆。