问题补充：
The steel plant being designed will be the greatest project next year.
A. built
B. being built
C. to build
D. to be built
答案：
A. built
B. being built
C. to build
(答案→)D. to be built
解析：考察非谓语动词.句意:正在设计中的钢铁工厂将会是明年最大的将要进行建设的工程.不定式表示具体的将要进行的动作,build是建造的意思,这个工程是建设的动作对象,故用被动语态..选D.
