单选题 A lot of school boys simply ______ all day when they are supposed to be at school.
【正确答案】 A
【答案解析】句意：很多男学生在该上学的时候不去上学，而是整天闲逛、无所事事。mess around无所事事；闲荡；胡闹。carry on经营；争吵；继续开展。pull up减速停下；突然停下。get through完成；读完；穿过。