they were singing a song.
simple past tense
past continuous tense
past perfect tense
none of these
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Answer:
the scientific study of very small living things
सूक्ष्म जीवों का वैज्ञानिक अध्ययन; सूक्ष्मजीवविज्ञान
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Answer is past continuous tense
The formula of past continuous tense is
S+ was/were + v1 + ing + O.
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