I don't know _ he still lives here after so many years.A.whether B where C.what D.when

i don't know _ _ _(多少次) HE HAS TRIED. I don't know when he _(come)back.when he _(come)back,I will call you I don't know what he needs I don't know how I can get there. 改为简单句I don't know _ _ _ there. I don't know where I can post this letter .=I don't know _ _ _this letter . I _ don't know what it is I don't know a _ o_ _of French. 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) I don't know. 【合并英语句子】.I don't know.HOW old are you?合成I don'tknow_ _ _ _. 合并英语句子.I don't know.HOW old are you?合成I don'tknow_ _ _ _.. 1.There is a new washing machine in the room.we know.(合并为一句)we know _ _ a new washing machine in the room2.Will he come back?i don't know.(合并为一句)I don't know _ _ _ come back. i don't think he is a good student,_ I don't know how I can get to the museum.（改为同义句)I don't know _ _ _ the museum I don't know how I can get to the museum.（改为同义句)I don't know _ _ _ the museum I don't know what he said的同意句是什么?I don't know what he said同义句I don't know — — I don't think he （是 know还是knows) I don't know what is he doing谢谢了,