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Tom, you play the violin so well. But I ______ you can play the violin.
A.didn’t knowB.don’t knowC.hadn’t knownD.haven’t known
A

试题分析:句意:Tom, 你的钢琴弹的这么好。但是我以前都不知道你会弹钢琴。根据句意作者表达的意思是“以前不知道你会弹钢琴”而现在知道了。所以“不知道”应为过去时态。故选A。
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