The traffic was held up for more than three minutes,which caused me to arrived late.请问这个句子是什么从句,为什么cased前用which ,which又实际的意思吗.请讲的透彻一些

i was held up by the traffic jam. The reason why he was late was that he was held up in the traffic jam. The reason why he was late was that he was held up in the traffic jam. Traffic was ______ for several hours by the accident .A held out B held up C held off D held on 为什么呢, what is the mean of “he was held up in traffic”? 短语辨析2.Why was the road crowded?The traffic was___ A___ by a car accident.A.held up B.held back C.held out D.held to请解析为什么不能选B, I was held up in traffic的中文意思 I was held up in traffic 的意思 I missed my father at the airport because my car was in the traffic jam填broke up kept back held up kept up哪个? i missed the lecture because my car was _ in the traffic jam.A.broken up B.kept back C.held up D.kept upQ:为什么选C呢,hold up in the traffic是一个固定搭配吗？ Traffic was __________ by the heavy fog for two hours．stopped from relieved from held up covered with 选哪个 _____the heavy traffic jam,john got to the place where the conference was held on time.in ____,he was the first one who came to the conference.第一空填though 还是although,第二空填什么? where was the Constitutional Convention held? be held in traffic是什么意思 英语翻译由于堵车,直到下午三点,我才赶到会场.because of the traffic iam,I _____ ______ _____ the place where the meeting was held ___ three o'clock in the afternoon. yesterday,heavier,was,than,traffic,the(.); testerday,traffic,was,heavier,than,the,morning(.) What a pity!I missed meeting my boss at the airport because my car was ______ in the traffic jam．A．broken up B．kept away C．held up D．kept up a queue of cars held up by the traffic light 的意思