---- Did he come back early last night?

---- Yes. It was not yet eight o’clock _______ he arrived home.

A．when

B．that

C．before

D．until

专利权人有权在其专利产品或产品包装上标明（）。

A、专利标记，自已照片

B、专利标记，专利号

C、专利号，自已照片