A. Big Ben was made in 1956 B. Big Ben had been silent many times C. the bells stopped ringing for two days D. Big Ben had been working well since 1956 参考答案:D 答案解析:[分析] 推理题。从文中可知1976年大本钟出现了问题,根据“…It was the first time for 20 years that Big Ben had been silent for