I am lucky the thing I enjoy doing most is I've ended up doing.
A. when... that
B. if...what
C. that... what
D. that... that
网友回答
A. when... that
B. if...what
(答案→)C. that... what
D. that... that
解析：语法结构题。难点：lucky后接that从句作宾语；宾语从句中的主语是the thing，其后是定语从句；宾语从句中的表语是what引导的从句。本句意思是：我很幸运。我最喜欢做的事已经完成了。