Hello! I ________ you _______ in London. How long have you been here?

A．don’t know, were

B．hadn’t known ,are

C．haven’t known ,are

D．didn’t know, were

英译汉：“Deratting certificate”，正确的翻译为( )。

A．安全非疫证书
B．复制证书
C．除鼠证书
D．免予除鼠证书