We had no one _____us, for we could deal with the case all by ourselves.

A．help

B．to help

C．helped

D．helps

患者男性，47岁，胸闷症状。心电图如图5-24所示：

应诊断为（）

A.二度Ⅰ型窦房阻滞

B.二度Ⅰ型房室传导阻滞

C.二度Ⅱ型窦房阻滞

D.二度Ⅱ型房室传导阻滞

E.窦性心律不齐