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IwalkproperlysinceIhadthatskiingaccident.A.wasn'tabletoB.haven'tbeenableto
题目详情
I _____ walk properly since I had that skiing accident.
A.wasn't able to
B.haven't been able to
A.wasn't able to
B.haven't been able to
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答案和解析
A和B分别是过去时和现在完成时,这俩的区别是：过去时很单纯的是过去某个时间点发生的事；现在完成时是从过去某一时间点开始某个行为（这里是“不能好好走路”）一直持续到现在.关于时态我们老师有给过时间轴一般时（...
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