胰十二指肠切除术后，持续胃肠减压2周，无排气，腹部无压痛，肠鸣音减弱，T波低平，考虑存在

A．低钾血症
B．等渗性缺水
C．高渗性缺水
D．低渗性缺水

The manager of the travel agency was trying hard to figure out how he would attract more customers ____ an extraordinary idea _____  his mind and he immediately knew what to do.     [ ]

A. when; flashed across  

B. as; crossed  

C. when; hit  

D. before; struck