I apologize if I__________you，but I assure you it was unintentional(无意的).

A．offend

B．had offended

C．should have offended

D．might have offended

民法规定诉讼时效制度的意义在于

A．惩罚债权人

B．保护债权人

C．督促债权人及时行使权力

D．保护债务人的合法权益