单选题：____________,itisquiteeasytodrillaholeinitwithlaser.

题目内容：

____________,itisquiteeasytodrillaholeinitwithlaser. A．Asdiamondishard
B．Althoughharddiamondis
C．Hardasdiamondis
D．Howeverdiamondishard

参考答案：

答案解析：

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