1. I've been waiting for you since 11.30. Соответствует варианту g since 11.50 a.m.
2. Zoe has been chatting to Mum for ten minutes. Соответствует варианту c for ten months.
3. Maddy has been reading since Thursday. Соответствует варианту d since nine o'clock this morning.
4. You've been writing that letter since breakfast. Соответствует варианту a since 10 a.m.
5. Our team has been getting better since 2008. Соответствует варианту h for two years.
6. I've been living in Townsville since May 2009. Соответствует варианту e since February.
7. He's been looking for his watch for two hours. Соответствует варианту f for two days.
8. We've been working on our project for a month. Соответствует варианту c for ten months.
Ответ: