证券公司办理定向资产管理业务，应保证客户资产与其自有资产、不同客户的资产相互独立，对不同客户的资产分别设置账户、独立核算、分账管理。( )

—When did you go to the United States?

-- I remember _______ there when I was ten.

A．having taken

B．to be taken

C．being taken

D．to take