Они уже уйдут к тому времени как мы доберемся. They will already have left by the time we get there. They will already leave by the time we get there. They will already left by the time we get there.

Задание

Они уже уйдут к тому времени как мы доберемся.

They will already have left by the time we get there.
They will already leave by the time we get there.
They will already left by the time we get there.