Be sure to make the invitations sent to has taken part in the competition.A. whoB. whomC.

问题补充：

Be sure to make the invitations sent to has taken part in the competition.

A. who

B. whom

C. whoever

D. whomever

答案：

A. who

B. whom

(答案→)C. whoever

D. whomever

解析：句意：确保把邀请函送到参加比赛的人手中。此处to是介词，其后是介词的宾语从句，从句缺主语，故用whoever。选C。