31. All the task ______ ahead of time, they decided to go on holiday for a week.

A. had been finished             B. were finished     C. having been finished         D. been finished

C


解析:

31. C�？疾楠毩⒅鞲窠Y(jié)構(gòu)。finish與主句的邏輯主語they沒有關(guān)系，所以要在finish前加上其邏輯主語all the task，而且與之是被動關(guān)系，強調(diào)完成，因此可以用having been finished。

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