i think i've watched it.如果是had 加过去式呢?

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i think i've watched it.如果是had 加过去式呢?
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i think i've watched it.如果是had 加过去式呢?
i think i've watched it.
如果是had 加过去式呢?

i think i've watched it.如果是had 加过去式呢?
had /have + 加过去分词,而不是过去时.
表示过去时间段里的某种经验,用现在完成时.不可以用过去完成时,除非前面是i thought

watched 过去时