Just as his word goes, “We are the ones we have been waiting for.” , Obama is no longer _____ he used to be, but an icon(偶像) .

A．who

B．what

C．which

D．that

就给定资料所反映的主要问题，用1 200字左右的篇幅，自拟标题进行论述。要求就细节问题进行分析阐述。