◎ 题干
We had already read the _____ before we operated the machine.

A. introduction
B. direction
C. explanation
D. instructions
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“We had already read the _____before we operated the machine. [ ]A. introduction B. direction C. explanation D. instructions …”主要考查了你对  【可数名词及其单复数】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。