单项选择题

A considerable amount of time and money has been invested in ______ this system.

A．defining
B．implying
C．reducing
D．perfecting
<上一题 目录 下一题>
热门 试题

单项选择题
The Japanese take pride in doing a job and getting it done ______ much time is required.
A．no matter how
B．the matter so
C．in a matter of
D．for the matter of
单项选择题
Mountain biking demands hill--walking strength as well as track-riding skills. Initially, choose gentle routes among familiar terrain or risk ______ shoulder-carriers!
A．long-term
B．elongated
C．prolonged
D．lengthened
相关试题