下列关于联合体投标的表述，错误的是（）。

A．由同一专业的单位组成的联合体，按照资质等级较低的单位确定资质等级

B．联合体各方应具备承担本施工项目的资质条件、能力和信誉

C．联合体各方签订共同投标协议后，不得再以自己名义单独投标

D．由不同专业的单位组成的联合体，按照资质等级较低的单位确定业务许可范围

单项选择。

What does your father do? [ ]

A. He's teaching.

B. He's at school.

C. He's a teacher.

D. He doesn't teach Chinese.