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
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B解析试题分析：将去图书馆，说明这件事情还未完成，正在做这件事。句意：我一完成我正在做的事情，我就去图书馆。考点：考查动词的用法。点评：本题难度适中。对动词的考查是高考必考的内容，需要掌握它们的词义、用法、时态及语态等，对它们的考查在单选、完形及短文改错中经常出现，足以引起考生的重视。即学即练：I wonder why Jenny ________us recently.We should have heard from her by now.
A.hasn’t written
B.doesn’t write
C.won’t write
D.hadn’t written 解析：A。用完成时表达到目前为止本应发生的动作。