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I soon found that the work I was doing ____ by someone else — in other words, I was wasting my time.
A.had already been doneB.has already been done
C.would be doneD.have already been done
A
主句I soon found是一般过去时态,宾从that the work____要用过去时态的某种形式,排除B,D;且工作已经被别人做了,要用过去完成时态。I was doing是定从,修饰the work。选A。
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