how long _______ he__________London before he came here?

how long _______ he__________London before he came here? you see,before he came down here, he came here two hours before 改错 坐等He came here before there days. He English for five years before he came here 1How long----you----(study) english since you came here? He's never been here before,_____he?-_____.He came here thre He came here a year _______,and I have been here _______ two 句型转换1).He came here in 2000.(同义句）He _______ ________ here __ 12. George _______ Lisa long before they came to this city. He sang just now.(用when I came here 改写句子） He _______ _______ How long before did he join the army?改错.