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
We tried to settle the problem with them as soon as possible, but they seemed to ______ sincerity.
A．lack of
B．be lack of
C．lack in
D．be lacking in
单项选择题
I can't read the marks and notes Jenny made in the margin because they are too ______.
A．faint
B．misty
C．transparent
D．opaque
相关试题