商业银行贷款应实行（）的贷款管理制度。
A.审贷一体、集中审批
B.审贷分离、集中审批
C.审贷分离、分级审批
D.审贷一体、分级审批
参考答案：C
如图所示为水位测量仪的示意图，从A点发出一束方向不变的光线，经水面反射后，在固定光屏PQ上形成一个光斑，光斑的位置随水位的变化而发生变化．当水面在CD时，屏上的光斑移到了B点．请根据平面镜成像的特点作出光路图（保留作图痕迹）．
I kept looking at the man, wondering _______.
A．whether I have seen him before
B．whether I had seen him before
C．that I had seen him before
D．when I saw him before
