By the time Mother reached home, Auntie Mei ________ already cooked dinner.
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Worked Solution
Step 1: Identify the two actions in the past. Mother reached home (Past Tense) and Auntie Mei cooked dinner.
Step 2: The action that happened first in the past requires the Past Perfect Tense (had + past participle).
Step 3: Since the dinner was cooked before Mother arrived, 'had' is the correct auxiliary verb.
Correct answer: had
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