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

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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

解析状语从句。由although引导的让步状语从句，可以换成由as引导的倒装句形式，句型一般为adj(adv或n)+as+主语+谓语。其他三个选项不表达让步意义。

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