Choose the best option to replace the underlined part to improve the given sentence. If no substitution is required, select 'No substitution.'
He opened the package by a knife.
Show answer & explanation
Correct answer: A
Explanation
The original sentence 'He opened the package by a knife' is grammatically incorrect because 'by' is used to indicate the agent doing an action, not the tool used to perform it. When referring to a tool or instrument used for an action, the correct preposition to use is with.