'I know his birthday . - thy complex sentence of this is __

A I know about his birth and its day .
B His birthday is know to me .
C I know when he was born .
D This is his birthday and I know it .

Correct Answer: I know when he was born .

Related Pronoun যুক্ত করে Simple বাক্যকে complex বাক্যে পরিবর্তন করা যায়। যেমন: who, what, which, that. 
Bissoy MCQ

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