大全 723 疑问

eshopaholic

1.       The debate over bilingualeducation centers on the issue of whether the United States should foster theidea of single common language, an idea, some believe, that has in the past beencrucial in binding diverse constituencies together.
(A) been crucialin binding diverse constituencies together
(B) been crucialas a binding together of diverse constituencies
(C) been crucialto bind together constituencies that are diverse
(D) become crucialin binding together diverse constituencies（A）
(E) become crucialto bind together constituencies that are diverse
答案A。 题干正确吗？主语是debate, 但没找到谓语
糊涂了，请点拨下。谢谢

婷婷玉立1990

centers on 谓语

eshopaholic

thank u