Question

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Answer 1

6: had done
7: had been building
8: had read
9: mustn't
10: Phil would have...

Answer 2

Відповідь:

3. My sister had been doing the homework since early morning.

7/17. They had been building a new school for six months when there was an earthquake.

10/17. If Caroline and Sue prepared the salad, Phil would roast meat

8/17.  правильно.

9/17. In some states, it is illegal to talk on a cell phone in your car. Those drivers mustn't use phones in their cars.