thank you all the same,mr black but i dont eat sweets.oh i am sorry i ______(not know )that为什么不用现在完成时?

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thank you all the same,mr black but i dont eat sweets.oh i am sorry i ______(not know )that为什么不用现在完成时?
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thank you all the same,mr black but i dont eat sweets.oh i am sorry i ______(not know )that为什么不用现在完成时?
thank you all the same,mr black but i dont eat sweets.oh i am sorry i ______(not know )that
为什么不用现在完成时?

thank you all the same,mr black but i dont eat sweets.oh i am sorry i ______(not know )that为什么不用现在完成时?
don·t know

我是之前不知道。所以是一般过去时、

do

didn't know

thank you all the same, mr black but i dont eat sweets. oh i am sorry i ______(not know )that
为什么用现在完成时呢?为什么用现在完成时呢?为什么用现在完成时呢?