The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, ______ meant spending tents of thousands of pounds.

A. who              B. that               C as              D. which

下列色彩属于补色关系的是（）

A、红—绿

B、红—黄

C、黄—蓝

D、黄—紫

E、蓝—橙