______ many times, my elderly mother still can’t remember how to light the gas.

A．Had told

B．Having told

C．Having been told

D．Being told

模块独立性是软件模块化所提出的要求，衡量模块独立性的度量标准是模块的 ( )

A．抽象和信息隐蔽

B．局部化和封装化

C．内聚性和耦合性

D．激活机制和控制方法