第一句是watching,因为完整的是when i was watching a tv play,于是省略了前面,只留下了watching a tv play.
第二句亲写的是正确的,主语是MARY,有表示完成时态的意思.因为没有收到,所以要发email.having是必要的.
（watch) a TV play ,I heard someone knocking at the window.句首
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