Mr. Smith an hour on this work A. spent B. took C. paid

问题补充：

Mr. Smith an hour on this work .

A. spent B. took C. paid

答案：

解析：考查“花费”的表达方法。句意“史密斯先生用一小时完成了工作。”spend +time/money on sth./(in) doing sth.；take指花费时间；psy“付款”。故选A。