He did not regret saying what he did but felt that he _____ it differently. [ ]

A. could express                    

B. would express

C. could have expressed                

D. must have expressed

病历摘要：男孩，早产儿，体重2000g，有胎内窘迫史，生后Apgar评分1分钟为3分，5分钟为6分。生后4小时患儿呼吸急促，呻吟，有呼吸暂停。查体：T37.0℃，精神差，鼻翼煽动，面色青灰，口唇发绀，心肺未见异常，双下肢肌张力松弛。

根据血气分析结果，考虑患儿诊断为新生儿呼吸窘迫综合征，下列哪项支持？（）

A.HCO升高

B.pH7.2

C.BE-15mmol/L

D.PaO40mmHg

E.PaCO68mmHg

F.PaO85mmHg

G.PaCO35mmHg

H.BE+5mmol/L