单项选择题

Though steam engines have now passed the _________ of their usefulness, their heritage remains.

A．prime
B．era
C．epoch
D．date
<上一题 目录 下一题>
热门 试题

单项选择题
The government _________ to approve the use of wide -spead surveillance when the Justice Department took objections.
A．is going
B．had been
C．was about
D．is coming
单项选择题
Peter's father asked him to spend his time on something _________ researching into instead of playing all the time.
A．worthy
B．valuable
C．worth
D．previous
相关试题