Choose the correct sentence.

A Only then I realized the truth about his plan.

B Only then did I realize the truth about his plan.

C Only then I did realize the truth about his plan.

D Only then did I realized the truth about his plan.

Solution

Correct Answer: Option B

- যখন কোনো বাক্য "Only then" দিয়ে শুরু হয়, তখন এটি একটি inversion এর নিয়ম অনুসরণ করে। এই ক্ষেত্রে auxiliary verb (সাহায্যকারী ক্রিয়া) subject এর আগে বসে।
নিয়ম:
- "Only then" + auxiliary verb + subject + main verb
- এখানে: "Only then" + "did" + "I" + "realize"
- সঠিক উত্তর: Only then did I realize the truth about his plan.

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