--How do you pay the waitress?-As a rule, they are paid .A. by hourB. by the hourC. by

--How do you pay the waitress? ---As a rule, they are paid .
A. by hour
B. by the hour
C. by an hour
D. by hours

A. by hour(答案→)B. by the hourC. by an hourD. by hours解析：表示“单位”的名词，前面要加定冠词。

就是这个解释

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