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Объяснение:

17.2. We've been revising for the exam lately.

3. Ken's been working on this jigsaw puzzle for a week.

4. They haven't been practicing at all recently.

5. Jenny's been playing computer games since 8 o'clock.

6. You've been reading that magazine all afternoon.

17.2. Has she been looking well, lately? (Yes, she has)

3. Have you been watching TV all afternoon? (No, I haven't).

4. Have they been planning this trip for a long time? (Yes, they have).

5. Have you been using my toothpaste? (No, I haven't)

6. Has he been working on his book lately? (Yes, he has)