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Fill in the blank in the following sentence with the most appropriate option:

She sent a recording of the class lecture, ______ by Professor Sinha.

Solution

✅ Correct Option: 4

The blank is a reduced relative clause: 'which was delivered by Professor Sinha' shortens to the past participle 'delivered'. A finite verb like 'was delivered' or 'is delivered' cannot follow the comma without a relative pronoun, and 'being delivered' wrongly suggests an action in progress.

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