Which of the phrases (a),(b),(c)and (d) given below each sentence should replace the phrase printed in bold in the sentence to make grammatically correct ? If the sentence is correct as it is given and 'No correction is required', mark (e) as the answer.
Tense inconsistency. The sentence is set in past tense. So use of can is wrong which should be replaced by could. Similarly, using present participle form of keep is wrong. It should be replaced by keep. B removes all the errors.
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