第34题: [单项选择]______ about the robbery, the policemen rushed out in their cars to catch the robbers. A. Having been informed B. Having informed C. Informing D. Be informed 参考答案:A 答案解析:根据题意,警察是“被告知”的,且该动作发生在警察“冲出去”之前,应用完成时态的被动语态,同时本句中已有谓语动词rushed,所以空格处的动词应该用非谓语动词形式,所以本题应用having been i