◎ 题干
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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“I'll go to the library as soon as I finish what I ________.[ ]A. was doingB. am doingC. have doneD. had been doing…”主要考查了你对  【现在进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。