大全 565 补充 26

Opening with tributes to jazz-age divas like Bessie Smith and closing with Koko Taylor’s electrified gravel-and-thunder songs, the program will trace the blues’ vigorous matriarchal line over more than 50 years.

(A) the program will trace

(B) the program shall trace

(C) there will be a program tracing

(D) it is a program that traces（A）

(E) it will be a program tracing
偶选D了, 为什么要用将来时啊