I only saw her once ( ) my stay in America ()里应该填什么介词?

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Ionlysawheronce()mystayinAmerica()里应该填什么介词?Ionlysawheronce()mystayinAmerica()里应该填什么介词?Ionlysawheronc

I only saw her once ( ) my stay in America ()里应该填什么介词?
I only saw her once ( ) my stay in America ()里应该填什么介词?

I only saw her once ( ) my stay in America ()里应该填什么介词?
during.在……期间.