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?
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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?](/uploads/image/z/10521507-3-7.jpg?t=though+without+hans+%2Cmafuxing+___chinese+language+in+a+rural+primary+school+in+huangzhong%2Cqinghai+for+30years.A+would+teach+B+will+have+taught+C+had+been+teaching+D+has+been+teaching+the+answer+is+D+%2Ctell+me+why+%2Cand+why+not+use+the+others%3F)
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?
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?
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