They're American boys.(改为单数)
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They''reAmericanboys.(改为单数)They''reAmericanboys.(改为单数)They''reAmericanboys.(改为单数)HeisanAmericanboy.
They're American boys.(改为单数)
They're American boys.(改为单数)
They're American boys.(改为单数)
He is an American boy.