—What do you think of the two students to take part in the competition?—They are hardwork

问题补充：

—What do you think of the two students to take part in the competition?

—They are hardworking as well as intelligent.

A. selecting

B. selected

C. having selected

D. to select

答案：

A. selecting

(答案→)B. selected

C. having selected

D. to select

解析：B考察非谓语动词。句义：你觉得那两个被选出来参加竞赛的学生怎么样？—他们很勤奋，也很充满。；逻辑主语the boy students与select之间构成逻辑上的动宾关系，所以使用过去分词的形式。