উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
has been training
Being started at past time if a task refers to the continuation up to present and creates the possibility of being continued in future as well, then it is ‘Present Perfect Continuous Tense’. So the answer is - Each of the Olympic athletes has been training for moths, even years.