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I'll go to the library as soon as I finish what I        .
A.was doingB.am doingC.have doneD.had been doing
B
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。
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