We have been talking about this topic _____ A.for a long tim

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We have been talking about this topic _____ A.for a long time B.already C.yesterday
D:for hours选什么?为什么?还有
Tom ____ watching China Open for hours during the seven-day vacation.
A has been B was C had been D was being
选什么?理由?
随便说说have been doing和have done的区别

1.D 现在完成进行时和时间段for hours搭配；for a long time很长时间,不如前者的for hours准确；already已经,不能和现在完成进行时连用；yesterday是一般过去时的时间状语
2.C had been watching是过去完成进行时,和句尾的时间状语相呼应.has been doing是现在完成进行时,大7天假日已经过去,故时态错误；was doing是过去进行时,表明在过去是一段时间里一直进行的动作,但他不可能在7天除此什么都不做了,另外和for hours也不匹配；was being doing,没有这种时态.
have been doing和have done的区别：前者强调进行性.两者经常可以换用.
再问：有这么一句话：I have been teaching for a long time又作何解释？ for hours和for a long time意思是什么？一样吗？可以翻译一下题目的中文意思吗？ have been doing和have done可以换用的具体例子，谢谢
再答： I have been teaching for a long time很长时间以来我一直在教学。 for hours几个小时；for a long time很长时间；意思不一样。下题目的中文意思：这个话题我们一直谈论了几个小时了。在那次为期7天的假期里，汤姆每次都连着看数小时的“中国网球公开赛”节目。 have been doing和have done可以换用的具体例子： I have been learning English for 30 years. = I have learned English for 30 years.

We have been talking about this topic _____ A.for a long tim 适当形式填空：The little baby has been _____(sleep) for a long tim We have been waiting a long time.不用for a long time 英文高手请进It has been a hot topic discussed heatedly for the tim I have been thinking about for purchasing it for a long time 5.Bruce must have been in China for a long time,_____?A.hasn I have been thinking about to purchase it for a long time.这句 5.Bruce must have been in China for a long time,_____? We have been good friends a long time.这里的a long time之前不用加for We have been waiting here a long time for the guest. we have been best friends for a long time 为什么best前不加the we have been best friends for a long time中friends为什么要加s