第11题: [单项选择]以内表面为工作面的带传动是() A. 平带 B. V带 C. 三角带 D. 以上都不是 参考答案:A
第12题:[单选题] The reporter said that the UFO _____ east to west when he saw it. A. was traveling B. traveled C. had been traveling D. was to travel 参考答案:A 题目是在考查过去进行时和一般过去式互为时间背景这个知识点,结构为:主语+was/were doing when 主+ did。故选A。