ক. wouldn't ✔
খ. hadn't
গ. didn't
ঘ. hasn't
ব্যাখ্যা: If Clause---এ Past Perfect Continuous (had not been driving) থাকায় এটি Third Conditional। ফলে Main Clause---এ 'wouldn't + have + V3' (wouldn't have hit) বসবে।
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