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रिक्त स्थान की पूर्ति करें: 'The scientist's _____ research has led to several breakthroughs in cancer treatment.'

Amediocre
Bamateur
Cpioneering
Dsporadic
Answer & Solution
Correct answer: C. pioneering
कई महत्वपूर्ण उपलब्धियां (several breakthroughs) उच्च-गुणवत्ता और मौलिक कार्य को दर्शाती हैं। 'Pioneering' (अग्रणी/नवीन) उपयुक्त बैठता है।
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