By the time Mr Tan arrived at the classroom, the students _______ their assignments.
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Worked Solution
Step 1: Identify the time reference. 'By the time Mr Tan arrived' establishes a past moment as the deadline.
Step 2: The students completed their assignments BEFORE that past moment. We need a tense that shows one past action completed before another past action.
Step 3: The past perfect tense (had + past participle) is used for this purpose.
Answer: had finished
Correct answer: had finished
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