I don't know what is wrong with the machine.We need an engineer to __ the problem.A.undertake B.encounter C.reveal D.identify

i don't know what love is but i love I _ don't know what it is I don't know what the matter with me is? I don't know what is he doing谢谢了, i don't know What class is she in 改错 I Don'T Know What It Is 歌词 I don't know what love is,because my I don't know what is your think的意思 Maybe I am cold people .Don't know what is What t( ) is it?I don't know.I don't have a watch. 宾语从句I don't know what is his name 还是 I don't know what his name is? 陈述语序?I don't know what wrong is with me .I don't know what is wrong with me . I don't know what is aunt.是what is aunt还是 what aunt is? 语序 i don't know what's the matter 还是 i don't know what the matter is i don't know what i he is a doctor.what is he?i don't know what he is?/i don't know what is he? 英语翻译I Know what I know,I don't know what I don't Know; I know what I don't know,I don't know what I know; I know what I know what I know,I don't know what I know what I don't know. I don't know,what's the situation.What is this?Why is that