Hepburn’s acting years, she insisted working closely with UNICEF.
A. Though, to
B. Throughout, to
C. Throughout, on
D. Throughout, onto
网友回答
A. Though, to
B. Throughout, to
(答案→)C. Throughout, on
D. Throughout, onto
解析：根据语境可知此句的含义是纵观赫本的演技年，她坚持与联合国儿童基金会密切合作的工作。此题考查介词的throughout和on的基本用法，前者表示纵观；后者与insist连用表示坚持，故选C。