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শূন্যস্থান পূরণ করুন: 'The scientist's _____ research has led to several breakthroughs in cancer treatment.'

Amediocre
Bamateur
Cpioneering
Dsporadic
Answer & Solution
Correct answer: C. pioneering
একাধিক সাফল্য বা যুগান্তকারী আবিষ্কার (several breakthroughs) উচ্চমান ও মৌলিক কাজের ইঙ্গিত দেয়। 'Pioneering' (যুগান্তকারী/পথপ্রদর্শক, সর্বপ্রথম উদ্ভাবিত) শব্দটি উপযুক্ত।
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