Eagle has been flying in the sky . . . . . last week. A. since B. for C. over D. before

The answer is since.

• Since is used to indicate the beginning of an event or action. In this case, the eagle has been flying in the sky since last week.
• For is used to indicate the duration of an event or action. In this case, the eagle has been flying in the sky for a week.
• Over is used to indicate a distance or a period of time. In this case, the
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