I could solve the problem.
I could have solved the problem.
I could solved the problem.
I could have solve the problem.
Source: ১৭ তম শিক্ষক নিবন্ধন পরীক্ষা (স্কুল পর্যায়) (30-12-2022)
Answer: I could have solved the problem.
Explanation:
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