At the evening party the host said _________ was able to solve the riddle could get a nice present as a reward．
A.whoeverB.whoC.no matter whoD.whomever在线课程A
考查名词性从句。the host said 后是一个宾语从句，宾语从句中有一个主语从句，主语从句中缺少主语，根据句意：在晚会上主持人说无论是谁能解出这个谜就会得到一个好的礼物作为奖赏。故用whoever，相当于anyone who,选A。