This could have worked if I ----been more cautious.

A had
B have
C might
D would

Correct Answer: had

3rd conditionl - এর নিয়মানুসারে Principal Clause - এ could have / would have /might have থাকলে if clause টি Past Perfect হবে। সুতরাং শূন্যস্থানে Past Perfect - এর auxiliary verb 'had' হবে।
Bissoy MCQ

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