let's___ (help)the old man carry the big box.

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let's___ (help)the old man carry the big box.
let's___ (help)the old man carry the big box.

let's___ (help)the old man carry the big box.
help 保持原形即可

let sb do sth 填help

let's_help__ the old man carry the big box.
let sb do sth 让某人做某事,属于固定搭配