2. 外语
  3. When our university laboratory bought this microscope we were given a one year’s _______.

When our university laboratory bought this microscope we were given a one year’s _______.

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问题 When our university laboratory bought this microscope we were given a one year’s _______.
选项 A、reservation
B、security
C、proof
D、guarantee
答案D
解析 根据句子意思，选择D为正确答案。One year’s guarantee：一年保修期
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