2017年6月大学英语四级作文常用关系词：时间关系

　　at once;

　　immediately;

　　at length;

　　in the mean time;

　　meanwhile;

　　at the same time;

　　in the end; then; soon;

　　not long after;

　　later; at once;

　　at last; finally;

　　some time ago;

　　at present;

　　all of a sudden;

　　from this time on;

　　from time to time;

　　since then; when;

　　whenever;

　　next point;

　　a few minutes later;

　　formerly;

　　as; once;

　　since;

　　occasionally;

　　in a moment;

　　shortly;

　　whereupon;

　　previously