I wanted to pay for the coffee, but I found that all I had was a couple of______coins.

【正确答案】 A

【答案解析】worthless：无价值的，不值钱的；priceless：无价的，极贵重的；invaluable：无价的，非常贵重的；inexpensive：便宜的。根据句意可知，选A。