It is ________ that I can still remember ______ was discussed at the meeting.

A．sure; when

B．sure; what

C．certain; when

D．certain; what

为抗击列强的侵略，在黄海大战中壮烈殉国的民族英雄是 [ ]

A、邓世昌

B、林则徐

C、左宗棠

D、关天培