求教一道语法题

weiyizhuce

Although many whites, noting the presence of some blacks in the middle class, think that the time for enforcing civil rights measures is past, Blacks generally are aware (that the figures for average income and unemployment show as wide of ) a radical discrepancy as ever.

答案是：that average-income and unemplyment figure show as wide
用that 从句没错，但答案中figure是单数啊，怎么用show不用shows呢？

猫猫头

average-income and unemplyment figure 是主语
两个单数并列谓语用复数形式