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Edward, you play so well. But I ________ you played the piano.
A.didn’t knowB.hadn’t known
C.don’t knowD.haven’t known
A

A。根据句意可知,说话者是“过去”不知道,现在已经知道了,因此句子用一般过去时。句意为:爱德华,你弹得太好了。但我之前不知道你会弹钢琴。又如:Hello! I didn’t know you were in London. How long have you been here? 你好! 我之前不知道你在伦敦。你在这里多久了?
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