单选题 You must follow the directions exactly, and if you become confusing, you must take the time to go back again and read them over.
【正确答案】 B
【答案解析】[解析] 应改为confused,因为confused表示“感到困惑”,而confusing表示“令人困惑”。本句的意思是:“你必须严格遵守说明指导,如果有疑惑,必须花时间从头再仔细阅读。”