Поставь глаголы в скобках в форму present perfect continuous.
1 He ... (work) here for over ten years.
2 Jill ... (swim) in this lake since
she was a child.

3 How long ... (you/take care)
of this injured bird?

4 They ... (study) very hard for
their exams.

5 My parents ... (donate)
to WWF for a long time.

6 The government ... (try) to reduce
pollution for years.

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