谓语动词是：has been eaten
他们一起才是这个句子的谓语动词.
如果是现在进行时（被动）,那么 is + being +eaten 一起构成谓语动词
（主动）,is + eating 一起构成
现在完成时（被动）have（has）+been+过去分词构成的.
因此要记住,多数句子（除了一般现在）,要把 助动词和动词一起认作谓语动词.
就这样,希望帮到你了；）
The cake has been eaten alreadyl 这里有has ,been 还有个变了形的eaten 到
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