What is really abnormal sleepiness is now almost the norm. 斜体部分

What is really abnormal sleepiness is now almost the norm. 斜体部分可替换为： ______
A、unique
B、regular
C、unusual
D、odd
【正确答案】：C
【题目解析】：unique 特殊的；regular 定期的；普通的；unusual 不寻常的；odd 古怪的；句意：真正不正常的嗜睡现在几乎成了常态。因此C符合题意。