Hewasabouttopickupthepieceofpap

发布时间：2020-07-26 07:37:08

He was about to pick up the piece of paper ________ a gust of wind blew it away.A.whenB.whileC.asD.since

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A解析…be about to do sth．when…“正要做某事，这时…”。
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