Jun Jie ________ for two hours before his mother finally called him for dinner.
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Worked Solution
Step 1: Identify the timeline. Both actions happened in the past (called).
Step 2: Determine the sequence. Jun Jie was studying *before* he was called.
Step 3: Choose the past perfect continuous (had been studying) to show a continuous past action that was interrupted by another past action.
Correct answer: had been studying
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