单项选择题

To some extent, the principle of secrecy has been ______.

A．maintained
B．held
C．observed
D．implemented
<上一题 目录 下一题>
热门 试题

单项选择题
______ may be said against Tony, it can hardly be argued that he is honest.
A．Whatever
B．What
C．That
D．Which
单项选择题
Not all details of the microchip's performance are ______.
A．available
B．adequate
C．sufficient
D．approachable
相关试题