He decided to the conference in person.A. participateB. take partC. attendD. join

问题补充：

He decided to the conference in person.

A. participate

B. take part

C. attend

D. join

答案：

A. participate

B. take part

(答案→)C. attend

D. join

解析：考查词组：A. participate in参加（活动） B. take part in参加（活动） C. attend 参加（会议，婚礼）上学等， D. join+组织/人，句意是：他决定亲自参加会议。选C。