----- Our holiday cost a lot of money.

----- Did it? Well, that doesn’t matter ________ you enjoyed yourselves.

A．unless

B．as soon as

C．as long as

D．though

男性，46岁，十二指肠溃疡并发瘢痕性幽门梗阻，反复呕吐宿食，消瘦，皮肤干燥弹性下降。入院后经术前准备，在硬膜外麻醉下行胃大部切除术。

特殊的术前准备是

A．心理护理

B．皮肤护理

C．每晚洗胃

D．配血、皮试

E．术前用药