【题目】—Were the audience allowed to join in the play?
—Yes, the actors duty it was to satisfy the audience were successful.

【答案】whose
【解析】句意：——观众们被允许加入到这部戏里面吗？——是的，把满足观众当做责任的演员是成功的。此处the actors是先行词，在后面的定语从句中做定语，所以答案是whose。