I . . . . . . . . this book since morning.

I . . . . . . . . this book since morning. Correct Answer had been reading

We use the past perfect continuous to talk about actions or events which started before a particular time in the past and were still in progress up to that time in the past.
Example: It was so difficult to get up last Monday for school. I had been working on my essays the night before and I was very tired.
Bissoy MCQ

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