Question

クーリッシュ

2行目のhave、had、hasが3つ繋がっているのはなんでですか

[芸術①]
03| 小説の題材
時間 30分得点
合格 22点
32点
解答
月
別冊p.3
In one way or another I have used whatever has happened to me in the course of
my life in my writings. Sometimes an experience I have had has served as a theme
and I have invented a series of incidents to illustrate it; more often I have taken
persons whom I have known slightly or intimately and used them as the foundation for
5 characters of my imagination.

Answer 1

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ゲスト1

目的格の関係代名詞が省略されていて、関係代名詞節が先行詞an experience を修飾しています。
an experience which I have had has served ～.
です。

関係代名詞節の which I have had の中のhave had が現在完了です。

an experience has served ～ でSVです。
has served が現在完了です。