有一事想求？2。obama,made___historybybe
2。obama, made ___ history by becoming the first african-american president in ___ natn's history. a./, the b.a; the c. the . / d. the, a 为什么选A，B不行吗，
作为学科,history是抽象名词,不带冠词.但当其前面有修饰词时,抽象名词变成了具体名词,就要(或可以)用冠词了.所以正确答案为A.