-Excuse me. Do you know         ?

- Last Sunday.

A．where he would like to visit

B．when he was back home

C．how he came here

D．why did he come to the zoo

小王在住宅装修后，又购置了大量新家具，室内空气中含有较多的有害气体．下列哪项是除去有害气体的最佳方法（　　）

A．关闭门窗、喷洒大量的醋

B．关闭门窗、放大量的茶叶

C．喷洒空气清新剂

D．打开门窗、通风透气