Common Error Detection
Find out whether there is any grammatical error in below sentence. What does Professor Dhavan / spend so many hours / in the laboratory?

What does Professor Dhavan
in the laboratory?
spend so many hours
No error

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Common Error Detection
Find out whether there is any grammatical error in below sentence. Since the attachment of airconditioned sleeping cars to all important trains, / travelling became very pleasant, / especially during the summer season.

No error
especially during the summer season
Since the attachment of airconditioned sleeping cars to all important trains,
travelling became very pleasant,

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