He___________(一定已很熟悉) with people here, or he couldn’t know everyone’s name and families here on his lust day of arriving.

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问题 He___________(一定已很熟悉) with people here, or he couldn’t know everyone’s name and families here on his lust day of arriving.

选项

答案must have been acquainted/familiar

解析 两个考查点:①表达对过去事情的肯定猜测:must have done表示对过去事情的断言“肯定……”;②短语“与……熟悉”,可以用be acquainted/familiar with表达。
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