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Ответ: ex.d

3) has had

4) all variants

5) all variants

6) I've known

7)we've been going

8)You've been wearing

Объяснение:

ex 2

2) we have been travelling

3) How long has he been working there?

4) she has been looking for

5) he hasn't been doing his homework lately

6) Have you been waiting long?

7) I have been looking after the children all day!