---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 biologyB.did study biologyC.had studied biologyD.studied biology
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C解析本题考查wish后接宾词从句的用法。Wish后接宾词从句，从句的谓语动词要用虚拟语气，因为题干提示与过去事实相反，故用had done。