I don’t know why . A. my sister Mary was laughing B. did my sister Mary laugh C. my si——青夏教育精英家教网—

摘要：I don’t know why . A. my sister Mary was laughing B. did my sister Mary laugh C. my sister Mary laughing

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I don’t know why ___________.

A. my sister Mary was laughing

B. did my sister Mary laugh

C. my sister Mary laughing

D.was my sister Mary laughing

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