The task requested did it careful and brave enough.
A. who,is
B. whom,was
C. whomever,were
D. whoever,be
网友回答
A. who,is
B. whom,was
C. whomever,were
(答案→)D. whoever,be
解析：考查名词性从句及虚拟语气。request要求，从句用should + v原形的虚拟语气，should可省略。whoever要宾语从句，在从句中能做主语，选D。