The county, ________ in the north of Shanxi, has a history of more than 1,400 years.

A．located

B．to be located

C．being located

D．locating

注册建筑师应当履行下列义务，其中错误选项为______。

A．在职期间可以兼任其他设计单位的董事长，但不得兼任总经理

B．保守在执业中知悉的单位和个人的秘密

C．不得允许他人以本人的名义执行业务

D．在其负责的设计图纸上签字