Students are encouraged to the design competition for robots at the university.A. take pa

问题补充：

Students are encouraged to the design competition for robots at the university.

A. take part

B. operate

C. join to

D. participate in

答案：

A. take part

B. operate

C. join to

(答案→)D. participate in

解析：本题考查动词辨义。participate in sth 意为“参加（某项活动）”。take part后应加in。