she had no choice but __.填to obey.为什么不填obey

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she had no choice but __.填to obey.为什么不填obey
she had no choice but __.填to obey.为什么不填obey

she had no choice but __.填to obey.为什么不填obey
因为but前没有do的各种形式,若有则省略to