2. 外语
  3. He often checks his laboratory tools __________________(以确保这些工具精确无误).

He often checks his laboratory tools __________________(以确保这些工具精确无误).

admin2010-05-09  30
问题 He often checks his laboratory tools __________________(以确保这些工具精确无误).
选项
答案to make sure that they are accurate
解析 此句主要考核不定式作目的状语的用法。
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大学英语六级

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