My colleagues and I were greatly puzzled by our repeated failures in the experim

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问题 My colleagues and I were greatly puzzled by our repeated failures in the experiment.

选项 A、distressed
B、discontented
C、annoyed
D、perplexed

答案 D

解析 puzzle使迷惑、不解。perplex使困惑，使迷惑。distress使悲痛，使忧伤。山s— content不满。annoy使苦恼，骚扰。

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