In U. S., children usually have to go to school when they are O three years old
о
four years old
five years old
six years old
O
Other:

Explanation:

In the USA, children start school when they are five or six years old. Depending on the state, schooling is compulsory until the age of 16 or 18. Children younger than five can go to a nursery school or preschool.

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