He found all but one exit blocked.

除了一个出口外，其余的出口都被封了。

youdao

As 409 students filed out of their exam, they found all but one exit blocked.

当409名学生列队离开他们的考场时，他们发现除了一个以外所有的出口都被锁住了。

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One issue I had with installing Xcode 4.1 is that it blocked at a certain point with a dialog indicating that I needed to exit iTunes.

我在安装Xcode 4.1时遇到的一个问题是，安装被阻留在了过程的某一处，弹出一个对话框提示我需要退出iTunes。

youdao

Meanwhile,the Pakistani army has blocked all entry and exit routes out of South Waziristan, where officials believe Mehsud's fighters are based.

VOA: standard.2009.10.03

But the exit might be blocked.

ECONOMIST: Bangladesh

The trust believes the fly-tippers, upon realising they had blocked their exit, then sawed down wooden gate posts to make their escape.

BBC: Cotswold Water Park counts cost of 'worst' fly-tipping

It escalated when they tried to take disciplinary action against the employee as other workers protested and blocked all exit gates, preventing senior executives and managers from leaving the factory.

BBC: India arrests after riot at Maruti plant