—Hi,Nancy,Ididn’tknowyouhadcomeback.Sohaveyougraduatedf...

问题详情：

—Hi, Nancy ,I didn’t know you had come back. So have you graduated from college?

       —Yes .I          Biology for four years in Nanjing.

       A．have studied        B．had studied          C．studied                D．am studying

【回答】

C

知识点：一般过去时及其被动式

题型：选择题