答:it is+被强调部分that+从句用来强调某一部分，例如:

it is you who are wrong.(强调主语）

it's li hua that I met in the street.(强调宾语）

it's in the street that I met Li hua.(强调地点状语）

it's at ten am that I woke up.

注意区别时间状语从句与强调句:

it's at ten that I woke up.(强调时间）

it's ten when I woke up.(时间状语）