B 开头单词

be at arm's length 伸手可及

be at an end 结束

be at a stalemate 处于一个僵持状态 陷入僵局

be at a low ebb 衰败

be at a loss 茫然不知

be at a loose end 不知做什么好 闲着无事 无所事事

be at a distance of 相隔

be at a disadvantage 占下风

be at 致力于；以…为目标；反复要求；袭击

be astonished at 对…感到非常惊讶

be astonished 吃惊

be assured of 确信

be associated with 和…联系在一起；与……有关，与……有关系

be assigned to 被分配给……，归属于

be assiduously engaged in writing 手不停挥

be asleep 睡着了

be asked to do 被要求（做）…

be ashamed of oneself 无以自容

be ashamed of evil deeds 羞恶

be ashamed of 为…感到羞耻