every week还是every weeks?

every week还是every weeks? Every week为什么不用weeks 英译中every four weeks every fourth week he goes to the cinema ().填every two weeks 还是every two week.哪 every second week every two weeks 有什么区别 every couple of weeks Every year I have___holiday.A:a two-week B:two weeks C:two-w we must rest from ___for a week or two weeks every year A wo we must rest from playing for a week or two weeks every year twice every week Mary( )housework every week does miss green doing word puzzles every week还是