According to a survey, few children from single-parent families have a hobby and that hobby ______ last for only a year or two.

A．ought

B．must

C．may

D．need

根据监管要求，商业银行可采用（）来计量市场风险资本。

A.基本指标法

B.内部模型法

C.高级计量法

D.内部评级法