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 reservation：保留，(旅馆房间等)预定，预约；security：安全；proof：证据，试验，考验；guarantee：保证，保证书，担保，抵押品，此处指的是保修一年，因此正确答案是D。

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