________twiceayear的精选

问题详情：________twiceayear，whetheritisacar，abusoratruck，isarulethateverydrivermustobeyinthiscity.A．Examining B．ExaminedC．Havingbeenexamined D．Beingexamined【回答】D[考查非谓语动词。句意：无论是汽车，公交车还是...