ক. If he studied more
খ. If he had studied more ✔
গ. Having studied
ঘ. Studied more
ব্যাখ্যা: Main Clause---এ 'would have passed' থাকায় Third Conditional নিয়ম অনুযায়ী If Clause---এ Past Perfect Tense (If he had studied more) হবে।
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