问题
选择题
As a rule, domestic servants doing odd jobs are paid ______.
A．by the hour
B．by hour
C．by an hour
D．by hours
答案
答案：A
by与the连用,可用于表示“以……为标准或单位”。又如：by the week, by the year, by the thousand等。注意：按重量计应表达为by weight。