(2014·山东省实验中学一模)—Have you graduated from Shandong University?

—Yes.I________there for 4 years.

A．studied　

B．have studied

C．had studied　

D．have been studying

图为“我国南方某地区等高线地形示意图（单位：米）”，图中虚线表示山脊线或溪流。读图回答下列各题。

与“飞流直下三千尺，疑是银河落九天”所描述景观相符的是（）

A.a

B.b

C.c

D.d