A:don't know…were
B:hadn't known…are
C:haven't known …are
D:didn't know … were
下列图片与所听内容是否相符( )
北京奥运会上,牙买加选手博尔特以9.69秒的成绩获得了男子百米冠军,他每秒大约跑____米?(得数保留两位小数)