He __________(一定已很熟悉)with people here, or he couldn’t know everyone’s name and f

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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 famih’es here on his first 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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