we must prevented him from giving away our secret变被动

we must __polluted water__ entering the clean river.prevented,from 和keep ,from选那一个呀? we must prevented him from giving away our secret变被动 We must 英语翻译Hi.Thank you for contacting CDJapan.I looked into it,and we received your order on August 7,but we still haven't received a confirmation from Alipaythat the payment has been completed.That prevented your order from getting processed.I'm s Hi'Mum!We're home! We must value what we If my lawyer ____here ten minutes earier,we __the busA had been ,would have prevented B were ,would preventC had been,would prevent D were,would habe prevented We must ( )(work)hard. we must call the We must help them? we must help it why we must sleep We must learn it we must find a We must purify the 英语的十个单句改错题（4）1.The old man must be prevented knowing the sad news.2.If the population keeps increasing,there will be only standing room leaving.3.We students should know what important it is to protect the enviroment.4.She use Hi,Canada,we are on our way! “we must study them.是“we must study them.