题目内容
When Mary came, I _____ on the piano.
| A．is playing | B．plays | C．was playing | D．played |
C
解析试题分析：考查时态：句意：当玛丽来的时候，我正在弹钢琴。从句意看，弹钢琴是过去某个时间正在发生，用过去进行时，选C。
考点：考查时态
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