他们正要敲定交易时，市场突然崩盘了。
They were on the point of closing the deal when the market crashed.
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were英 /wɜː/|美 /wər/
on英 /ɒn/|美 /ɑn/
point英 /pɔɪnt/|美 /pɔɪnt/
of英 /əv/|美 /əv/|英 /əv/|美 /əv/
closing英 /ˈkləʊzɪŋ/|美 /ˈkloʊzɪŋ/
解释
were on the point of closing：复数过去式 were 加 on the point of 加 closing，表示「正要完成/关闭」交易，when 引出打断事件。
They were on the point of closing the deal when the market crashed.
were on the point of closing：复数过去式 were 加 on the point of 加 closing，表示「正要完成/关闭」交易，when 引出打断事件。