Some of them were so drunk they were needed taking to a hospital.

英訳に間違いが有れば正してください。

彼らの中の幾人かは酷く酔っていて病院に連れて行かなければならなかった。
Some of them were so drunk they were needed taking to a hospital.

ヒント
動詞の用法

答え were neededをneededにする

Some of them were so drunk they needed taking to a hospital.

主語+need+動名詞
主語が動名詞される必要がある

日本語に訳すと受身形ではないのに、主語が~されるになる分かり難い文

I needed going into the finals.
決勝進出が必要