This year the number of the US students in China has increased by 18.4percent pared to last year.
Ato study
Bstudying
Chaving studied
Dstudied
网友回答
A. to study
(答案→)B. studying
C. having studied
D. studied
解析：考察分词用法。本题考察的是分词短语作定语的用法。Students与study构成主动关系，使用现在分词的形式表示主动。Studying in China修饰students。指在中国学校的美国学生。句意：与去年相比，今年在中国学习的美国学生的数量已经增加了百分之18.4.故B正确。