题目

Havingbeen warned of potential danger in the street at night, she had to go home witha friend her（陪伴）. 答案：【1】accompanying设集合A={1，2}，B={1，2，3}，C={2，3，4}，则（A∩B）∪C=（ ）A．{1，2，3}B．{1，2，4}C．{2，3，4}D．{1，2，3，4}