Question

8.Katherine was sitting in an armchair resting. She was tired because. ...

very hard.
O A she was working
O B she's been working
O C she'd been working

Answer 1

Katherine was tired because she had been working very hard.

Step-by-step explanation:

Katherine was sitting in an armchair, resting and feeling tired because she had been working very hard. The phrase 'she'd been working' in option C is the correct answer.

Answer 2

The answer is choice b.