I don't know __ is __ you are after.A.that...when B.that...what C.what.../ D.what...where请问答案应该是哪个?

where is the railway station?I don't know.合并成一句 I don't know __ __ __ __ __. I _ don't know what it is I don't know 同意句转I don't know.I __ __ __. Don't you know today is Kate's birthday Sorry I __(forget). What if I don't know anyone?同义句What __ __ __ if I don't know anyone I don't know how I can get there. 改为简单句I don't know _ _ _ there. sorry,I don`t know.= sorry,I have__ __ I don't know what I should do next.(同义句转换） I don't know __ __ __next i don't know where she __(live) who is 什么?I don,t know I don`t know who is she I don't know where I can post this letter .=I don't know _ _ _this letter . i don't know what this word means,同义句转换 i don t know __ __ __this word when () Mr White __(leave) home?sorry I don't know I __(not notice) him leavingmother is going __(swim) this afternoon I don't know a _ o_ _of French. I have no friends here.I don't know what I should do. I have no friends here.I don't know __ __ __. I don't know what her reaction is __ to be,so I don't dare to tell her the result.A.likelyB.probable C.possible D.perhaps 有这么多纪念品,我不知道该选择哪一个There're _ _ souvenirs,and I don't know _ _ _ _.=I don't know _ _ _ _ _ (复合句)