结构推理
I had to keep the video camera readily accessible because of the possibility that I saw something that needed to be filmed. (in case)
【正确答案】I had to keep the video camera readily accessible in case I saw something that needed to be filmed.
【答案解析】[译文] 我必须把摄像机带在身边以便随时拍下我看到的需要拍下的东西。