Edward, you play so well, but I _____ you play the piano.
A．didn’t knowB．hadn’t knownC．don’t knowD．haven’t known
A
考查時(shí)態(tài)。本題意為我本不知道你會(huì)彈鋼琴，表示原來不知道，因此用一般過去時(shí)即可
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