Don’t blame him any longer; he______(那时一定在专注地读书).must have been focused on his b

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问题 Don’t blame him any longer; he______(那时一定在专注地读书).

选项

答案 must have been focused on his book then//must have been completely wrapped up in his book then

解析考查情态动词表猜测。对过去某个行为的肯定推测用情态动词must have done。“专注于……”可译为befocused on sth．／／be wrapped up in sth．／／be indulged in sth．。

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