In spite of his working hard, he could not pass the exam.(complex)

A He worked hard and he could not pass the exam.

B He worked hard but he could not pass the exam.

C Working hard he could not pass the exam.

D Though he worked hard, he could not pass the exam.

Correct Answer: Option D

Simple Sentence এর In spite of + possessive + verb + ing এর জন্য complex sentence এ though/although বসে।