由于缺乏证据，警方只好把他放了。

In the absence of any evidence, the police had to let him go.

youdao

由于缺乏证据，警方不得不把他释放了。

In the absence of evidence, the police had to set him free.

youdao

由于缺乏证据，警方不得不把他释放了。

In the absence of evidence, the police had to set him free.

youdao