单选题 You (will) almost always (find) Caroline (playing) a video game because she enjoys (to be challenged).
【正确答案】 D
【答案解析】改为being challenged。enjoy后接名词或动名词，根据该句句意enjoy后又应该是被动语态(喜欢被挑战)，动名词的被动式就是being+过去分词。