Laura said she had worked on the assignment since _______.
two hours ago
the day before
the next day
Correct Answer: GET
In the indirect part is the past perfect tense (had worked) => the direct sentence is the present perfect tense. The adverb of time in the direct sentence will be “yesterday” when changed to the indirect sentence will become “the day before/the previous day”.
Laura said that she has been doing this exercise since yesterday.