though without hans ,mafuxing ___chinese language in a rural

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though without hans ,mafuxing ___chinese language in a rural primary school in huangzhong,qinghai for 30years.
A would teach B will have taught C had been teaching D has been teaching
the answer is D ,tell me why ,and why not use the others?

for后面加时间,表示一段时间,所以要用完成时.A,B排除.have been doing表示一个行为从过去一直持续到现在,到目前为止还没有结束,并有可能继续下去.had been doing表示过去某个时间之前发生的动作

though without hans ,mafuxing ___chinese language in a rural 用"without a second though"造句英语翻译The statement that clothing is a language,though occasio 横线填空：They say that ___chinese language is especially difficu have language in common 还是have a language in common 英语翻译Hans lives in a small town in England.He used to stay in 英语翻译The first container ship .第一个集装箱船Born in 1913 in a rural without being a thing in 英语翻译In 2009 China began to implement a new rural social pens 英语翻译In rural areas,you can have a lot of the fun of childhoo Children who live in the rural areas are very___to be poor.A 一道初中英语填空提It's our duty ( ) help the poor children in rural a