Question
Read each sentence carefully to find out whether there
is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence marked (a), (b), (c) or (d).If the sentence is correct as it is, choose “No error ” as option (e) your answer. Ignore errors of punctuation, if any. The director spoke with such authority and clarity during the briefing (a) that even those initially sceptical of the proposal (b) was persuaded to reconsider their position (c) by the strength of the argument presented (d). No error (e)Solution
The error lies in part (c) due to subject–verb mismatch within a result clause. The subject those is plural, but the verb was persuaded is singular. Correct form: were persuaded. This is a subtle agreement error often tested at higher difficulty levels.
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