In this situation, he has no choice but to act.

Due to his illness, he had no choice but to take a day off from work and rest at home.

He was forced into a situation where he had no choice but to quit his job.

He was placed in a situation where he had no choice but to continue his job.

In the final scene, one cannot help but cry.

I think this situation is unavoidable.

Since the train was stopped, I had no choice but to use a taxi.

I forgot my username.

He starts talking about himself at every opportunity, causing trouble for the people around him.

He likes to take a walk in the park at dusk.