Sandstorms in Asia seem in recent years as a result of desertification.A. to increaseB.

问题补充：

Sandstorms in Asia seem in recent years as a result of desertification.

A. to increase

B. to have increased

C. having increased

D. increasing

答案：

A. to increase

(答案→)B. to have increased

C. having increased

D. increasing

解析：原句意思是，由于沙漠化，近几年亚洲的沙尘暴在增长。不定式、现在分词都可以作表语，表示将来的含义时，一般用不定式。不定式的完成式表示的动作发生在谓语动词表示的动作之前，强调动作的先后顺序。所以选B。