His mother lets him ___ (do) his homework first every day.空怎么填?怎么不does啊?

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His mother lets him ___ (do) his homework first every day.空怎么填?
怎么不does啊?

do
let sb.do sth.

do

do
let sb do是固定短语

do
let sb do sth 让某人做某事