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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