问题
选择题
He _____ play the piano now, but he _____ play it one year ago.[ ]
A. couldn't; can
B. can; couldn't
C. can; could
D. could; can
答案
答案：B
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He _____ play the piano now, but he _____ play it one year ago.[ ]
A. couldn't; can
B. can; couldn't
C. can; could
D. could; can
答案：B