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单选题
在钻孔之前，要确保钻头的尖端是锋利的。
A
A.Before drill the hole, make sure that the point of the drill head is sharp.
B
B.Prior to drill the hole, make sure that the point of the drill bit is sharp.
C
C.Before you make the hole, make sure that the point of the drill bit is sharp.
答案解析
正确答案：C
相关知识点：
钻孔前钻头要点考点明
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