----Hi,nancy.I didn't know you had come back.So have you gra

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----Hi,nancy.I didn't know you had come back.So have you graduated from college
----yes,I _________ French for four years in Nanjing.
A.have studied
B.had sutdied
C.studied
可是A为什么不行啊?

答案是C
因为从第一句中已知nancy已大学毕业,因此在大学学法语这一动作已在过去某一点（毕业时）终止.在英语中如果某一动作在过去某一点已终止,无论该动作在过去延续多长时间都用一般过去时,描述过去的行为.

----Hi,nancy.I didn't know you had come back.So have you gra ----Hi,Nancy,I didn’t know you had come back.So have you gra I didn't know you had come back 中的had come 不该用have came back Sorry to have kept you waiting so long.I didn't know you__he Hi,Ann!I didn't ( )to see you here.Susan said you had gone t -Hi,Mary. -Hi,Lucy. I ------- you are here. A.didn't know B. I didn't know you were so busy一般疑问句 I didn't know you were so busy. I don't know （） come back soon. （）back ,I‘ll let you know 英语翻译I didn‘t know you were coming,so I didn’t buy any beer.( didn't know you were so busy. Hi,Xiao jin.I hear you have jist come back form your vacatio