---How much can i earn by taking this job?---Well,it depends.You will be paid ___.A.by an hour B.by hour C.by the hour D
问题描述：
---How much can i earn by taking this job?---Well,it depends.You will be paid ___.A.by an hour B.by hour C.by the hour D.by hours
答
c固定用法,但是by weight 例外