35．The highest award was given to Anna whoso hard on the project for years and at last h

问题补充：

35．The highest award was given to Anna, whoso hard on the project for years, and at last her efforts paid off.

A. has worked

B. worked

C. was working

D. had been working

答案：

A. has worked

B. worked

C. was working

(答案→)D. had been working

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