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是一般過去時(shí)態(tài)，賓從that the work____要用過去時(shí)態(tài)的某種形式，排除B,D；且工作已經(jīng)被別人做了，要用過去完成時(shí)態(tài)。I was doing是定從，修飾the work。選A。
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