He'd better ___ (not eat)anything for twenty four hours.

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He'd better ___ (not eat)anything for twenty four hours.
He'd better ___ (not eat)anything for twenty four hours.

He'd better ___ (not eat)anything for twenty four hours.
就填not eat.had better后面接动词原形,如果表达否定意思,直接在动词原形前面加not.
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not eat
had better (not) do sth ,用动词原形,最好不要做某事

He'd better not eat anything for twenty-four hours.

答案:not eat。
考查知识:
had better do sth 最好做某事
其否定形式为:had better not do sth 最好不要做某事。