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

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

admin2010-02-22  5
问题 ______, it is quite easy to drill a hole in it with laser.
选项 A、Hard although a diamond is
B、As a diamond is hard
C、Hard as a diamond is
D、How hard is a diamond
答案C
解析
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