单项选择题

______ , it is quite easy to drill a hole in it with laser.

A. As diamond is hard
B. Although hard diamond is
C. Hard as diamond is
D. However diamond is hard
<上一题 目录 下一题>
热门 试题

单项选择题
______ I sympathize, I can't really do very much to help them out of the difficulties.
A. As
B. Whether
C. While
D. Now that
单项选择题
The serious environmental problem exist nowadays, because adequate measures for preventing them ______ taken in the past.
A. was not
B. were not
C. were not being
D. being not
相关试题