31. When he arrived his wife ... . A) has already left B) had already left C) already left D) was already leaving

В данном предложении необходимо использовать Past Perfect, так как действие (жена ушла) произошло до другого действия в прошлом (он пришел).

Правильный вариант: B) had already left.

Ответ: B) had already left