By the time of last year, she ______ the piano for five years.
A．learntB．has learntC．had learntD．will learn
C

試題分析：句意：到去年為止，她已經(jīng)學習鋼琴五年了。結(jié)合語境可知本描述的是一直持續(xù)到去年的動作，故用過去完成時態(tài)，選C。
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