Choose the best option to replace the underlined part to improve the given sentence. If no substitution is required, select 'No substitution.'
Please submit your assignments by Friday.
Show answer & explanation
Correct answer: D
Explanation
The preposition 'by' is used correctly here to indicate a deadline or the latest time something should be completed. The options 'till Friday' and 'until Friday' are also grammatically correct for indicating a time limit, but 'by Friday' is already a standard and clear way to express a deadline, so no substitution is required.