Q30

Unlike that of earlier works on slavery, Blassingame's innovative study relies not on the records of Whits slave owners but on the records of the slaves themselves, especially the 70 or so autobiographies and memoirs that have been preserved.

A) that of earlier works on slavery, Blassingame's

B) that of earlier works on slavery, Blassingame in his

C) earlier works on slavery, Blassingame in his

D) earlier works on slavery, Blassingame's

E) the earlier works on slavery, Blassingame in his

答案：A

我觉得应该是D, earlier works 和Blassingame's innovative study 不是很对应吗？我看不出A选项的that指代什么。请nn帮我看看吧。