The rise in electricity costs has our difficulties in carrying out the project.A. added u

问题补充：

The rise in electricity costs has our difficulties in carrying out the project.

A. added up

B. added up to

C. added

D. added to

答案：

A. added up

B. added up to

C. added

(答案→)D. added to

解析：考查短语辨析。句意“电价的上升已经增加了计划实施的困难。”added up“累计”；added up to“总共；意味着”；added to“增加”。故选D。