人寿保险中，用过去所交付的纯保费终值减去过去给付保险金的终值的理论责任准备金计算方法称为( )。

A．未来法
B．估计法
C．过去法
D．终值法

—I locked myself out of my apartment. I didn’t know what to do.
—You may call your roommate.()

A. could have called

B. might have called

C. would have called

D. must have called