“Would you be ______ help me?”     “I'd very much like to.”

A．kind enough

B．so kind to

C．so kind as to

D．as kind as to

男性，46岁，心脏进行性扩大6年，曾住院诊断为扩张型心肌病，本次因气急加重、水肿明显1周来诊，门诊检查疑有大量心包积液，下列哪项最支持此诊断（）

A.吸气时收缩期较呼气时降低20mmHg

B.心电图示肢导低电压

C.心音低钝

D.心界扩大

E.颈静脉怒张