1.Upon/on seeing the magazine,I became interested in it.
2.The moment/minute I saw the magazine,I became interested in it.
3.Hardly had I seen the magazine when I became interested in it.
4.No sooner had I seen the magazine than I became interested in it.
5.Immediately I had seen the magazine I became interested in it.
或者I became interested in the magazine immediately I had seen it.
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