they kept a close guard over the thieves这句中为什么要加一个a不加可以吗又成什么意思了 在这里的over又是什么意思可以用to吗

We kept a close watch on the enemy in case they got close to us at night.怎么翻译?为什么用close而不用closely? 英语翻译1They kept a close guard over the thieves.1这里的over啥意思啊.2帮我直译 they kept a close guard over the thieves这句中为什么要加一个a不加可以吗又成什么意思了 在这里的over又是什么意思可以用to吗 They kept to ask me a lot of questions改错! They urged that the library _________ open during the vacation.A.must be kept B.is kept C.would be kept D.be kept They kept on walking ＿＿they found a lake.填while还They kept on walking ＿＿they found a lake.填while还是when? close closely的英语题Mary and Jane are ____friends,they usually stand____to each other wherever they are.A close,close B close,closely C closely,closely D closely,close讲清close和closely的区别 they ___on walking until they found a lack.为什么用kept而不是continued We kept the door of our classroom_____all the afternoon.A.close B.closing.C.opened D.open dual-way transaction costs?If the annual appreciation of the currency can be kept below 3 percent, it will make it hard for speculators to profit, since they will have to pay dual-way transaction costs that will be close to what they can gain from a the great scientist（ ）his close correspondence with his former tutor.a:has been still kept upb:has still kept up c:is still kept up d:still keeps up They become close friends Don't go and ___the doors and windows.They are___.A.close;open B.open;open C.open;close D.close;close closed,close； open,opened的区别They thought he was a strange man,for he kept all his windows ______ all the year round.A closedB closeYou had better keep your mouth ______ and your eyes ______.A shut; openB shut; opened为什么第一题选用 a close --These books ____ in the library for along time .--I think they are too old to be read .A.have kept B.had kept C.have been kept D.were kept顺便也告诉我第一句话是什么时态啊 they made fire ( )in winter.A,and keep warm B,to keep warm C,kept warm she always laughts at a good joke though it was late .they kept on working