44. Though the term ＂graphic design＂may suggest laying out corporate brochures and annual reports, they have come to signify widely ranging work．from package designs and company logotypes to signs，book jackets，computer graphics，and film titles．
(A) suggest laying out corporate brochures and annual reports，they have come to signify widely ranging (B) suggest laying out corporate brochures and annual reports，it has come to signify a wide range of (C) suggest corporate brochure and annual report layout，it has signified widely ranging (D) have suggested corporate brochure and annual report layout, it has signified a wide range of (E) have suggested laying out corporate brochures and annual reports，they have come to signify widely ranging
哪位大侠帮忙解释B和D的区别。官方解释有点ambiguos。谢谢 | 
