Mr. Bob, ______ as a manager for many years, found it hard to be an ordinary clerk again.

A．having worked

B．worked

C．to have worked

D．working

根据《中华人民共和国担保法》规定，担保的法定范围包括（）。

A.违约金

B.实现债权的费用

C.质物保管费用

D.主债权

E.利息