Question
Although he had prepared well (1)/ for the interview,
(2)/ he could not answered (3)/ several of the technical questions (4) Read the sentence 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. The letter of that part is the answer. If there is ‘No error’, the answer is (5). (Ignore errors of punctuation, if any).Solution
"Could not answered" should be "could not answer," as "could" is followed by the base form of the verb.
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