Identify the correct passive voice construction: A. Hazardous waste was dumped by the company. B. The company dumped hazardous waste. C. The waste is dumping by the company. D. Dumping hazardous waste by the company. 答案解析 核心考点：被动语态结构 解题思路：被动语态结构为be动词+过去分词+by agent。 选项分析：A正确；B为主动语态，C动词形式错误，D为不完整句子。 易错点：可能误选C，但'dumping'现在分词不可作被动谓语。 正确答案：A