I watched the man for a long time and wanted to know      .

A．whether I have seen him before

B．where I had seen him before

C．that I had seen him before

D．when did I see him

Smart fortwo是一款特别的汽车，Smart fortwo车型方案的最重要特征是什么？（）

A.可更换的车身面板

B.尺寸紧凑，汽车长度低于2.7米

C.特别的内部设计

D.低油耗

E.为年轻人设计的时尚车型