He has a part - time job and was paid．A. by the hourB. by an hourC. by hourD. each hour

问题补充：

He has a part - time job and was paid．

A. by the hour

B. by an hour

C. by hour

D. each hour

答案：

(答案→)A. by the hour

B. by an hour

C. by hour

D. each hour

解析：意指“按小时付钱”。B和c两个表达方式都不对，D不合句子意思。