they worked three days_____

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they worked three days_____
before ago long for哪一个?
before和ago有什么区别,简洁些,

ago表示的时间以现在为基准,意思是“在现在以前”,因此要和动词的过去时连用,不和现在完成时连用.
before是指从过去某一时间算起的一段时间以前,意思是“在那时以前”、“更早的时候”,动词常用过去完成时,特别是在间接引语中用得多

例：I visited him three days ago,but his neighbour said he had gone to London two days before.
我3天前去拜访他,可是他的邻居说早在2天前他就到伦敦去了.

they worked three days_____ They had a rest after they worked about three hours.(改为同义句) they have worked in the factory for three years,（对划线部分提问) They worked ___________(hard). It was three years since they worked here.这是高二的一道改错题,答案是把wor They worked hard yesterday afternoon. They worked hard at___(sing). Of the three boys, Tom worked ____ I worked in Shanghai for three years So they worked as hard as they could 同义句转换 So they worked as They worked out the math problem . They worked very hard this morning.