—What would you wish to do if you were a college student again?—That's very hard to say b

问题补充：

—What would you wish to do if you were a college student again?

—Thats very hard to say, but I wish I when I was a college student.

A. has not studied biology

B. did study biology

C. had studied biology

D. studied biology

答案：

A. has not studied biology

B. did study biology

(答案→)C. had studied biology

D. studied biology

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