语法与词汇
15.
_____, it is quite easy to drill a hole in it with laser.
A、
Hard although a diamond is
B、
As a diamond is hard
C、
Hard as a diamond is
D、
How hard is a diamond
【正确答案】
C
【答案解析】
由although引导的让步状语从句，可以换成由as引导的倒装旬形式，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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