18. (单选题) As a rule, domestic servants doing odd jobs are paid_____.(本题1.0分)
A、 by the hour
B、 by hour
C、 by an hour
D、 by hours
出自:陇东学院-大学英语2(专升本)

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块