This could have worked if I ____ been more far-sighted.
had
have
might
would
Explanation:
Correct Answer is: had
Conditional sentence এর main clause এ could/would/might have + v3 থাকলে if clause এ had + v3 ব্যবহৃত হয়। সে হিসেবে option গুলোর মধ্যে (ক) had সঠিক।