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In the following sentence,four words or phrases have been underlined.One of them is incorrect. Select the INCORRECT word or phrase from the given options. ExoMars has already been delayed by technical problems, and recent failures of its parachute system in trials have caused real concerns for engineers who fear they  have to delay the mission further.

In the following sentence,four words or phrases have been underlined.One of them is incorrect. Select the INCORRECT word or phrase from the given options. ExoMars has already been delayed by technical problems, and recent failures of its parachute system in trials have caused real concerns for engineers who fear they  have to delay the mission further. Correct Answer Have to delay

  • The correct answer is option 4
  • 'Has already been delayed' is grammatically correct because the subject is a third person singular number so 'has' is used followed by 'been' and the past participle form of the verb 'delayed' because it is in Passive voice.
  • 'Have caused' is also appropriate because the mentioned a past event which has some present consequences.So present perfect tense is used
  • 'Who' which is a relative pronoun is also correct because it is describing  the word 'engineers.
  • 'Have to delay' is incorrect because it is an assumption.' Might should be used before 'have'.

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