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
前句說。Edward，你（鋼琴）彈得這么好，可見現(xiàn)在已經(jīng)知道“你彈鋼琴”，不知道是在過去，而不是現(xiàn)在，因此句子用一般過去時(shí)。
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