The books of WEBDubois before World War I constituted as fundamental a challenge to the accepted ideas of race relations (that, two generations later, will be true of) the writings of the radical writers of the 1960’s. a. that, two generations later, will be true of b. that, two generations later, would be true of c. as, two generations later, would be true of d. as, two generations later, would e. just in the way that, two generations later, did 偶是缴枪了....哪位朋友解释下,答案先不公布