单项选择题

When our university laboratory bought this microscope we were given a one year's

A．reservation
B．security
C．proof
D．guarantee
<上一题 目录 下一题>
热门 试题

单项选择题
The football player had studied economics in the university for ______ of roughly six years.
A．a decade
B．a time
C．an age
D．a period
单项选择题
We won't encourage him to do that ______ he is in good health.
A．even if
B．in case
C．even though
D．when
相关试题