题目

Lang Ping, who is said to have started her coaching career in America, ____ volleyball in China for almost twenty years. A、played   B、have played  C、was playing  D、had played 答案：A 解析: 考查过去时态。做此题的简便方法是找出句子的主干，“ Lang Ping ___ volleyball in China for almost twenty years.”。然后用代入法即可选出答案。下列反应是化合反应，也是氧化反应的是A．氢气燃烧 B．石蜡燃烧C．铜绿受热变黑 D．碳酸受热分解