I can't understand _____.

I can't understand _____. i can't understand no i can't understand这是哪首歌? I can’t understand ________. 是I can't understand 还是I don't understand? _____ i understand what you say ,i can't agree with you. I can't understand it,will you please _____ once more? 15.I can't understand it,will you please _____ once more? I can't understand it,will you please _____ once more?A.expl 15. I can't understand it, will you please _____ once more? I don’t think the boy can understand it.He is _____ young.A. I can't understand.I don't understand.I'm not understand,这三个 I can't understand English and I can't speak