The accidental encounter with an old friend,
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The accidental encounter with an old friend(名词词组做主语), whom he had not seen for two years(修饰主语的非限制性定语从句), made(主句谓语) him (主句宾语)very excited(主句宾补)

与一个两年不曾谋面的老朋友的意外邂逅使他非常激动

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