We never know( )he is,They say he is a doctor

A.whom
B.what
C.where
选哪个~~~为什么
老师怎么选C的啊

we never know the worth of till... we will never know we will never...we will never say you never relay until you tauch求歌曲的名字? 想要Roman fischer——we'll never know 的英文歌词 关于Roman Fischer的<We'll Never Know>的歌词. never know中文歌词 We know we dream, we dream we know. 求翻译 5. There’s a feeling in me ____ we’ll never know what a UFO is– not ever. we will never surrender, ........ we never have.we never will什么意思？ For All We Know歌词