一道高一英语选择题Hello!I_____you_____inL
Hello!I _____ you _____ in London.How long have you been here? A.don't know;were B.hadn't known;are .haven't known;are D.didn't know;were
D 因为How long have you been here 所以用were，BC排除掉 另外我过去不知道，现在知道了。所以don't know要用过去是