—The hall for international conferences is of great importance—I see and we are sure to c

问题补充：

—The hall for international conferences is of great importance

—I see, and we are sure to complete it on time

A. built

B. to be built

C. having been built

D. building

答案：

A. built

(答案→)B. to be built

C. having been built

D. building

解析：考查不定式的被动做定语：句子主干为The hall is of great importance。主语the hall后为非谓语动词短语作后置定语。因the hall与动词build之间为被动关系首先排除D从答句中的..we are sure to complete it on time可知该大厅还没有完工因此排除表示“被动完成”的A、C两项而选表示“未来将完成”的不定式的被动式。选B