I am not sure ____ there are living things on the planets or not.A.whethere B.where C.why D.if我纠结于A与D选项.希望能得到正确答案

I am not sure when I should go.(同义句)I am not sure when ____ ____ I am not sure是什么意思 Er...i am not sure. 英语-为什么这用i ami am not sure为什么不是I don't sure I am not sure whether it will be ____ ____(平局) this time. I'm sure I am not wrong i am not sure反义疑问句 I am not sure what your talking 翻译成中文：I am not sure i am not sure 什么意思 I am not sure同义句 maybe.but I am not sure. Sure.I am not a bad I AM NOT SURE YET?什么意思? I am not sure.that I am gay I think I love you,But I am not sure now是哪首歌的歌词?I don’t know why.I don’t know how.I think I love you,But I am not sure now. I am not sure what else to I am not sure what else to say. I am not sure yet同义句I am not sure yet=?