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

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

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问题 ______, it is quite easy to drill a hole on it with a laser.
选项 A、Hard although the diamond is
B、Hard as the diamond is
C、How hard is the diamond
D、As the diamond is hard
答案B
解析 倒装。as引导的让步状语从句，必须使用倒装结构，常见为表语前置。
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