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。根據(jù)句意可知，說話者是“過去”不知道，現(xiàn)在已經(jīng)知道了，因此句子用一般過去時。句意為：愛德華，你彈得太好了。但我之前不知道你會彈鋼琴。又如：Hello! I didn’t know you were in London. How long have you been here? 你好! 我之前不知道你在倫敦。你在這里多久了?
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