He got on such a hunt for an idea until he had caught it
he（主语）,got on（谓语）,such a （定语）,hunt（宾语）,for an idea（介词短语作定语,修饰idea）.He got on such a hunt for an idea为主句,后面是until引到一个状语从句,he（主语）,had caught（谓语）,it（宾语）.
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