[請益] with which of

[avalox (...)]

A striking fact of twenty-century history is the tenacity with which of
ethno-national groups have maintained their distinct identity.

想請問第一行末"with which of"在本句結構中扮演著什麼樣的角色？

如果直接把"with which of"拿掉是否可以呢？

感謝！

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◆ From: 121.97.133.43
※ 編輯: avalox          來自: 121.97.133.43        (10/15 16:29)
※ 編輯: avalox          來自: 121.97.133.43        (10/15 16:29)
→ bruceccy:with tenacity=tenaciously
→ bruceccy:have maintained their distinct identity tenaciously