The demand for skilled workers is still increasing.A. highB. higherC. highlyD. more highl

问题补充：

The demand for skilled workers is still increasing.

A. high

B. higher

C. highly

D. more highly

答案：

A. high

B. higher

(答案→)C. highly

D. more highly

解析：考查副词辨析：high做副词是具体的概念，highly做副词是抽象的概念，这里用highly修饰skilled，表示抽象意义，句意是：对高技术的工人的需求仍在增长中。选C。