prep07,this同位语

qiongle

84. (29059-!-item-!-188;#058&003806)

The Nobel Prize in chemistry was awardedto three scientists for their discovery that plastic can be

made electrically conductive--an advancethat has led to improvements in film, television screens,

and windows.

(A) that plastic can be made electricallyconductive--an advance that has led

(B) that plastic can be made electricallyconductive--this advance leading

(C) that plastic can be made to beelectrically conductive, and this advance led

(D) of plastic's ability to be madeelectrically conductive, with this advance leading

(E) of plastic being able to be madeelectrically conductive--an advance that has led

AB的an advance和this advance指代前面的内容应该都可以吧？

linnnn

答案是选a么？

qiongle

恩，选A，求解答