—  I told you that he would come to see you.

—  Actually I had little doubt _____ it was true. [ ]

A. that               

B. whether    

C. since      

D. if

患者，男，26岁，心悸气短，胸闷晕厥。胸骨左缘第3肋间可闻及3/6级收缩期杂音，超声示室间隔左室流出道处肥厚。应用后会使该杂音增强的是

A．心得安

B．硝酸甘油

C．卡托普利

D．呋塞米

E．硝苯地平