The building now will be used as our reading room.A. builtB. to be builtC. being builtD. i

问题补充：

The building now will be used as our reading room.

A. built

B. to be built

C. being built

D. is built

答案：

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。