they only had a scrap of information with which to work form 请问这是什么从句?为什么有个which呢?请高手帮我解答,万分感谢

___snacks and drink,but they also brought cards for entertainment when they had a picnic in the forest.A.Not only they brought B.Not only did they bring C.Not only brought they D.Not only they did bring after the patients went into the office ,---- working选啥啊,最好说明理由A only a doctor did they see B only a doctor saw they C only a doctor they saw D only a doctor had they seen After the patients went into the office,＿＿working.A.only a doctor did they see B.only a doctor saw they C.only a doctor they saw D.only a doctor had they seen They had talked only for a few minutes( )they found they were of different opinions.unlesswhilebeforeonce很着急 They had only one room to _____.A:live B:stay C:live in D:keep Only after they had discussed the matter for several hours ______ an agreement.A.they reached B.do they reach C.they reach D.did they reach Only after they had discussed the matter for several hours ______ an agreement.A.they reached B.do they reach C.they reach D.did they reach 英语单项选择：They hurried to the cinema,____the film had finished.They hurried to the cinema,____the film had finished.A.only findingB.only to findC.only foundD.only find 状语从句练习1.Only after liberation___ to be treated as human beings.A.did they begin B.they had begun C.they did begin D.had they begun 为什么选a不选c ___snacks and drink,but they also brought cards for entertainment when they had a picnic in theforest.为什么答案是 not only did they bring ,not only broght they 不可以吗 Only after__ for three hours in the train hours in the rain did the reach the destination.A.they had walked B.had they walked C.they walk D.do they walk they had a nice d____________. They spent ( ) little they had ( ) a very expensive car.A how;buying;B what;buying;C that;to buy;D only;to buy 我看不懂. only after they had discussed the matter for several hours _____ a decision.a.they reached b.did they reach c.they reach d.do they reach请求翻译并详细解析 they had only a small house( ) but they didn't complaina.to live b.to live in c.for living d.for living in 高中英语——倒装1.After the patients went into the office,_____ working.A.only a doctor did they see B.only a doctor saw theyC.only a doctor they saw D.only a doctor had they seen2.We were watching with fascination,and,out from the bag _ some nearly 70%women say they would marry a man only if he ___an apartment ,according to a national report.A has B would have C had D had had the answer is C,.tell me why ,thank you ,translate it _______ snacks and drinks ,but they also brought cards for entertainment when they had a picnic in the forestA,Not only they broughtB,Not only did they bring C,Not only brought they三个都是倒装啊，究竟选哪个 B和C有什么区别