For an old man ______(run) fast is dangerious.

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Foranoldman______(run)fastisdangerious.Foranoldman______(run)fastisdangerious.Foranoldman______(run)

For an old man ______(run) fast is dangerious.
For an old man ______(run) fast is dangerious.

For an old man ______(run) fast is dangerious.
答案:running
现在分词表示主动,前面不是一个句子,不能用一般现在时,只能用现在分词表示主动.

running,
running fast 在句子中作主语