Question : Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution'.
One must brush up on entire course before the day of examination.
Option 1: brush about
Option 2: brushing on
Option 3: No substitution
Option 4: brushing off
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Correct Answer: No substitution
Solution : The third option is the correct choice.
The phrase brush up on means to review or refresh one's knowledge or skills in a particular subject. This idiomatic expression is commonly used when preparing for an examination or any other activity that requires a renewed understanding of a topic. The given sentence is well structured and conveys the intended meaning.
Therefore, no substitution is required.
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