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can not but 后接省去to的动词不定式表示\"不得不,只好\"例:I can not but admire his courage. 我不得不钦佩他的勇敢。另外,下列习惯用语中都带有but,后面都接不带to的不定式:  can not help but do…   can do nothing but do…   can not choose but do…   can not do anything but do…