问题补充：
My brother wants to work in the factory which now.
A. is building
B. has been built
C. is being built
D. is to be built
答案：
A. is building
B. has been built
(答案→)C. is being built
D. is to be built
解析：考查时态和语态。句意：我的各个想到那所正在被修建的厂里工作。根据本句的now说明这座厂正在被建设，所以使用现在进行时的被动语态。故C正确。
