题目内容
【题目】昨天当我到家时妹妹正在弹钢琴。
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【答案】My sister was playing the piano when I got/arrived/reached home yesterday.
【解析】表示当某事发生时另一个动作正在进行，应该用过去进行时表达。was doing sth when+从句，弹钢琴play the piano ；到家reach/arrive /get home ,故填My sister was playing the piano when I got/arrived/reached home yesterday.
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