语法练习介词和频度副词【巩固练习】. 用in, on, at填空。 1. _ Sunday 2. _Monday morning 3. _ April,25th. 4. _ 20105. _ 5:00 6._ night 7. _ Spring 8. _ March 9. _ 9:45 10. _ Mothers Day . 用always, usually, often, seldom, never, sometimes填空, 每个词用一次。 1. Do you often go to the cinema? Er, _. Maybe t