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This is the hardest job（ ）.
A、that I have ever done
B、that I was ever doing
C、that I ever done
D、that I had ever done
【正确答案】：A
【题目解析】：现在完成时have/has done表示动作发生在过去，但与现在的情况有联系。“it/this/that is the +最高级+名词+that...”结构中，that从句中的动词常用现在完成时。