Correct Answer: Option B
Before এর আগে past perfect tense (sub+had+past participle) হয়, পরের অংশ past indefinite tense হয়। After এরপর past perfect tense (sub+had+past participle) হয়, আগের অংশ past indefinite tense হয়। এখানে passive voice use হয়েছে।
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