单选题 A boy told the policeman that he had seen a man ______.
【正确答案】 C
【答案解析】[解析] 动词不定式作宾语补足语。感官动词需要用省略to的动词不定式或现在分词作宾语补足语。例如:He saw his brother getting off the bus when he crossed the street.(他过马路的时候,看见他的哥哥正在下车。)其他选项与题意不符。