匈奴曾是西汉王朝的心腹大患，但下列哪次战役后，匈奴再也不能与西汉抗衡了

A．漠北战役

B．巨鹿之战

C．官渡之战　

D．淝水之战

— Did you hear the news this morning?

— Oh, yes, _____ was announced on the radio has caused great excitement among the students. [ ]

A. that

B. what

C. as

D. it