[文法] 倒裝與否的問題

[banco (Acoustic)]

請問下面的句子當中，could 應該要置於[1]還是[2]呢?

At that time, there was an ongoing debate about by using which phonetic
attribute [1] voiced and voiceless stops [2] be effectively distinguished.

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→ priv:我可以問你為什麼想要倒裝嗎?
→ banco:我是被 "by using ..." 搞迷糊 orz
→ priv:不好意思我對那種拿比較深的句字來問國中文法的人沒什麼耐心
→ priv:這邊根本沒有出現倒裝句的條件
→ priv:而且也不是問句，助動詞當然沒有提前的理由
→ priv:我相信I don't know who he is.國中就有教過了
→ banco:瞭解了, 謝謝