诊断急性肺脓肿最有价值的是（）。

A.畏寒发热

B.咳大量脓臭痰

C.白细胞总数及中性粒细胞增高

D.痰普通细菌培养阳性

E.大咯血

__________ is important to a person is ___________ he must know _________ he is fit for.

A．What; that ; what

B．That; how; what

C．It ; that ; that

D．It; what ; that