I'm sorry,I ____understand.Can you speak more slowly?要填couldn't还是don't?Why?

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I'm sorry,I ____understand.Can you speak more slowly?要填couldn't还是don't?Why?

I'm sorry,I ____understand.Can you speak more slowly?要填couldn't还是don't?Why?
I'm sorry,I ____understand.Can you speak more slowly?
要填couldn't还是don't?Why?

I'm sorry,I ____understand.Can you speak more slowly?要填couldn't还是don't?Why?
都可以的
都可以表示不明白
相信我 一般是用的don’t