A) has being b) is been c) has been
6. did you know he's been teaching german_ fifteen years?
a) before b) since c) for
7. we have been watching tv - we had dinner
a) for b) since c) by
8. he has _ too hard today.
a) working b) works c) been working
9. has it_ raining since you arrived?
a) be b) been c) is
10. my brother has been travelling_ two months.
a) since b) for c) by
11. my dad smoking in the garage.​

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