Essential safety _______ must be taken when attempting to patch up this electrical device.

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问题 Essential safety _______ must be taken when attempting to patch up this electrical device.

选项 A、measures
B、prerequisite
C、calculation
D、recommendation

答案A

解析复合名词(N1+N2)意义上相当于把N1作为宾语、N2作为动词，或者“为了N1的N2”。这里就是相当于“为了safety的measures”，也就是“为了安全的措施”。因此A选项为正确答案。

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