When Mary came, I _____ on the piano.
A．is playingB．playsC．was playingD．played
C

試題分析：考查時態(tài)：句意：當瑪麗來的時候，我正在彈鋼琴。從句意看，彈鋼琴是過去某個時間正在發(fā)生，用過去進行時，選C。
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