，故填I。
【20题详解】
考查副词。句意：最后，普伦基特的建议是，在数字生活中做出更谨慎的选择，尽管为人父母常常是如此令人困惑地模糊，以至于专注似乎不可能。修饰形容词vague用副词，根据句意可知此处表示“令人困惑地”，故填A。
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