题目内容
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 |
C
解析
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In the U.S, ______a tip is thought to be polite when paying the bill.
| A．leave | B．having left | C．leaving | D．being left |