【题目】When the girl did ________ the courage to tell her parents what had happened, unfortunately her own family didn't believe her.
A. work outB. work upC. work atD. work on
在线课程【答案】B
【解析】
考查动词词组辨析。句意：当这个女孩逐步鼓起勇气告诉她的父母所发生的事情时，不幸的是她自己的家人不相信她。A. work out算出，制定出；B. work up逐步发展；C. work at致力于；D. work on从事于。故选B。