A. Choose for or since. 1. I've worked her for/since 6 years. 2. He has lived in Berlin for/since three months. 3. Florencia has studied English for/since she was 7 years old. 4. We've been waiting for/since 12 hours. 5. They have been practicing for/since months. 6. Augusto has known Malvina forlcince2011
