While a guard slacked_____ ,a thief entered the building.应填哪个介词?

While a guard slacked_____ ,a thief entered the building.应填哪个介词? guard a guard of怎么翻译? While two detectives were keeping guard at the door请问这里的guard at the door是固定搭配吗? much more than a guard 什么意思 baby.i guard you at a later CNN新闻中的一句话while a Russian military honor guard and band were on hand to mark the occasion.请问这句话是什么意思呢.尤其是 band这里是什么意思呢. While two detectives were keeping guard at the door.分析一下此句中keep的用法,guard在句中是动词吗? 有关while 用法while two defectives were keeping guard at the door ,two others opened the pacel.这里的WHILE可不可以换成WHEN. 用in a way,pass on,guard against造句． Is willing to guard you a lifetimi是什么意思 a guard stopped lenin at the gate变疑问句 Still:Your heart is a precious thing,guard it well! no one goes on guard against a gag Passengers are warned to be ____against pickpockets on buses.A.in guard B.on guardC.with guardD.at guard guard是什么意思? guard me guard against