作业帮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?
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 20:25:30
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