题目

When he was a boy, he used to go there and watch _____. A. to repair bicycles B. bicycles to be repaired C. bicycles being repaired D. repairing bicycles 答案：C 解析: 用-ing形式一般式的被动语态作宾语补足语，强调自行车被修理的过程。下列食品中，不需要借助发酵技术的是A．苹果醋 B．西瓜汁 C．酸奶 D．泡菜