on the guard 、on the watch 、on watch 、on alert的区别是什么?The customs inspector was_____for smugglers.A.on the guard B.on the watch C.on watch D.on alert 为什么选B啊?我觉得几个意思都差不多诶...

Commission on the national guard and reserves是什么意思 The police warned people to be _________ for pickpockets during the Christmas rush.A.at guardB.on earsC.guard our attentionD.on guard on guard against 有没有on guard TCAV ON GUARD on on on the 翻译the citizens were warned to be on guard against a sudden night attack on the guard 、on the watch 、on watch 、on alert的区别是什么?The customs inspector was_____for smugglers.A.on the guard B.on the watch C.on watch D.on alert 为什么选B啊?我觉得几个意思都差不多诶... the prince sat in the car with a guard on ____ side of him答案either为么不用each 21.All the students in my class the lecture given by Dr.Wang yesterday.A.appreciated B.approached C.pronounced D.interrupted22 The army and the people on the island were the attacks from enemies.A.on guard against B.in guard to C.on guard to D.in gua When he had killed the guard,he dragged him into the bushes.相当于_____the guard he dragged him into the bushesA On having killedB When killingC When having killedD On having been killed 用带on的短语填空快!While the guard was _____,he heard a shot.You must not _____,lerve this room.可以选用以下短语：on display,on show,on business,on foot,on duty,on the whole,on fire,on purpose,on the average,on any account,on second on having killedWhen he had killed the guard,he dragged him into the bushes.为什么可以写成On having killed the guard he dragged him into the bushes.为什么不写成Having killed the guard he dragged him into the bushes. on the ON THE on the on the on the