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Past Perfect или Past Perfect Continuous?

1. I won because I (had played/had been playing) this computer game before, and I knew how to play it.

2. The children's clothes were dirty. They (had played/had been playing) in the garden.

3. Larry (had read/had been reading) this book three times, but he couldn't understand it.

4. I was scared because I (hadn't ridden/hadn't been riding) a motorbike before.

5. I (had walked/ had been walking) all morning, so my feet hurt in the afternoon.

6. Sandra was very tired. She (had worked/had been working) in the garden all day.

7. She (had cried/had been crying) all night.

8. She was happy because she (had passed/had been passing) her driving test

9. George was a wise man because he (had travelled/ had been travelling) a lot when he was young

10. Mary (had travelled/ had been travelling) for three months, and she didn't want to stop ​