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

问题描述:

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.
如还有不明白的,请继续追问!He'd是什么的缩写?是he had 的缩写。he had better是“他最好……“的意思。