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Hard as a diamond is ,it is easy to drill a hole in it with

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Hard as a diamond is ,it is easy to drill a hole in it with laser .为什么要带冠词呢?不是说表语位于句首时省略冠词吗?
Hard as a diamond is ,it is easy to drill a hole in it with
a是不定冠词.这里没将a省略是因为前半句是一个让步状语从句,它跟着后面的主句走的.变一下形势是:As a diamond is hard,it is easy to drill a hole in it with laser.若省去a句子前后所指主语不一致.灵活运用.