They put forward a lot of plans at the meeting, none of _______ carried out in their work.

A．which

B．them

C．what

D．that

主机板有许多分类方法。按扩展槽可分为( )。

A．Slot 1主板、Socket7主板

B．AT主板、Baby-AT主板、ATX主板

C．SCSI主板、EDO主板、AGP主板

D．EISA主板、PCI主板、USB主板