When paying for a taxi he never looks at his wallet –just takes out one note and hands i

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。