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_______, it is quite easy to drill a hole in it with a eraser.
A、Hard a diamond is
B、Hard as a diamond is
C、As a diamond is hard
D、How hard is a diamond
【正确答案】：B
【题目解析】：A缺少连词，C项as引导原因状语从句与主句意义正好相反。B项为让步状语从句，把被强调部分放在句首，此处as可用though来代替。