উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
by
The correct answer is 'by'. 'by' is the most appropriate preposition to fill in the blank as 'by your watch' has the idiomatic meaning of "according to". It generally means that the person is asking the time shown/displayed by your watch.