Theburglarwascaught__________A．whileheleftthehouseB．

The burglar was caught__________.

A．while he left the house

B．when he was left the house

C．as he was leaving the house

D．as soon as he was leaving the house

正确答案：C
as引导的时间状语从句表示“正当……的时候”表示动作正在进行与主句的动作前后连贯所以选C