The building now will be used as our reading room.
A. built
B. to be built
C. being built
D. is built
网友回答
A. built
B. to be built
(答案→)C. being built
D. is built
解析：考察非谓语动词作定语用法。根据now可知大楼正在被建，所以使用现在分词的被动形式。现在分词短语being built now修饰前面的名词the building,在句中作定语。句意：现在正在被建的那栋大楼将会被用作阅览室。