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g often many times Ⅱ .根據(jù)句意用 for或 since填空 haven’t seen each other for a long time. father has been in the Party since 10 years ago. film has been on for 20 minutes. Green has worked here since he came to China. grandparents have been dead for several years. 。例如 : I haven’t seen him for a long 。例如 : —How long has Mary been a teacher?瑪麗成為老師已經(jīng)多久了 ? —Since two years 。例如 : I have lived in