Firemen had been fighting the forest fire before they could get it under control.这句话里could能够换成be able

When the firemen arrived,the fire___put out.A.has been B.had C.was D.had been Firemen had been fighting the forest fire before they could get it under control.这里的before是什么意思?在---之前?它引导的是不是状语从句? Firemen had been fighting the forest fire before they could get it under control.这句话里could能够换成be able had been Firemen had been fighting the forest fire for nearly three weeks before they couldget it under control.请问get it under control 是词组还是什么,这是怎样搭配在一起的 新概念英语2册62课问题.1.firemen had been fighten the forest fire for nearly three weeks.意思是：消防员用了3个星期就火.帮我改成：消防员救完火后的3个星期.2.the planes had been planting seed for nearly a month.意 what had been done had been done. 1.The firemen have been examining the ground _______yesterday.A.since B.for C.ago D.by2.They discovered the cause _________.A.by chance B.chancily C.fortunately D.luckily3.The bird had snatched up the snake form the ground.It had _____it.A.taken B.pu where had she been? had been什么时态 英语翻译had been reading 新概念英语第53课Hot Snake.A bird had snatched up the snake from the ground.为什么要用过去完成全文内容At last firemen have put out a big forest fire in California.Since then,they have been trying to find out how the fire began.Fore 关于 be able 我看语法书上写的be able to表示成功的做成某事,不能用could.而新概念2册的62课 Firemen had been fighting the forest fire for nearly three weeks before they could get it under control.这里为什么不用be able FIG是什么? FIG是什么意思 have been talking, had been told? 英语,has been和 had been Had been telling和 Had told