Какой правильный вариант a-c нужно выбрать, чтобы завершить предложения?

1. How long .......in sales?
   • a) do you work
   • b) have you been working
   • c) were you working
2. By the time I came back from my business trip, a lot of things ....... .
   • a) had changed
   • b) has changed
   • c) changed
3. The company is huge. It........ a thousand new jobs since the beginning of last year.
   • a) created
   • b) has created
   • c) had created
4. We ....... this product since the beginning of the year.
   • a) have produced
   • b) have been producing
   • c) had produced
5. I'm afraid the company is going bankrupt. It ........big problems lately.
   • a) had
   • b) has had
   • c) was having
6. So, what ........ since I last saw you? What's new'?
   • a) have you been doing
   • b) did you do
   • c) were you doing
7. The number of employees cycling to work.........
   • a) increased
   • b) have increased
   • c) has increased
8. Mary left work very late. She........letters all day.
   • a) was typing
   • b) has been typing
   • c) had been typing

Английский язык 11 класс Времена глаголов Новый