问题补充:
When paying for a taxi, he never looks at his wallet –just takes out one note and hands it over.
A. by accident
B. on occasion
C. at random
D. on average
答案:
A. by accident
B. on occasion
(答案→)C. at random
D. on average
解析:短语辨析. A.偶然的;意外的B.有时;偶尔C.胡乱的;随便的;任意的 D. 平均;普通,通常 根据题意看出当付出租车钱的时候他从不看他的钱夹,只是随便的拿出一张纸币递过去了。所以应选C。