题目：The watch was very good,and he _____20 percent down for it.

答案：A

解析：【考查点】考查同义词的用法

pay：花费，用法：sb pay money for sth

cost：花费，用法：sth cost sb+金钱

bought：buy的过去式，买，用法： buy sb.sth / buy sth for sb

spend：花费，用法： sb spend time/money on sth / sb spend time/money in doing sth

2.翻译：这手表非常好，他以少20%的价格买了它

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