i had no choice but to do it at once中had是什么词性,是不是实义动词，but后面的

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i had no choice but to do it at once中had是什么词性,是不是实义动词，but后面的to可以省吗。我觉得had在这是实义动词，所以to可省。另外，情态动词算作系动词吗

你好，
这涉及but加动词不定式的用法.
当不定式结构作 but（except,besides）等介词的宾语,且 but（except,besides）等词前面的句中有实意动词 do 时,该不定式结构中的 to 要省略,否则一般不省略.
所以，句中的to不能省略。had是实意动词。
情态动词不是系动词。
kylexiu为你解答，希望能帮到你，望采纳。

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