Lily managed to acplish the teacher encouraged her to do.
A. that
B. what
C. which
D. whether
网友回答
A. that
(答案→)B. what
C. which
D. whether
解析：考查名词性从句。句义：莉莉成功的完成了老师鼓励她去做的事情。把握关键词：acplish，动词，后面跟宾语从句，A. that无词意，不做成分 B. what 在从句中做主语或者宾语。…的…, C. which 哪一个 D. whether是否，根据后面从句中do 后少宾语，所以B正确。