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

   —That's 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

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

   —That's 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

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

   —That's 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

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

—That's very hard to say, but I wish I when I was a college student.

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

—That's 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