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One of the US national security advisers ____ there ____ better intelligence sharing before the September 11 attacks.
  • a)
    had acknowledged / can be
  • b)
    acknowledges / might be
  • c)
    has acknowledged / could have been
  • d)
    acknowledged / must be
  • e)
    would acknowledge / will have been
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
One of the US national security advisers ____ there ____ better intell...

The correct answer is C: has acknowledged / could have been.
Explanation:
- The sentence is talking about something that happened in the past, before the September 11 attacks.
- The phrase "has acknowledged" is in the present perfect tense, indicating an action that started in the past and has continued up to the present.
- The phrase "could have been" is in the past conditional tense, indicating a possibility or speculation about the past.
- This combination of tenses correctly conveys the idea that the national security adviser acknowledged the need for better intelligence sharing before the September 11 attacks, and it is a possibility that this could have prevented the attacks.
- The other options do not use the correct tenses or do not convey the same meaning as the original sentence.
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Community Answer
One of the US national security advisers ____ there ____ better intell...

Explanation:

Context:
The sentence is discussing the need for better intelligence sharing before the September 11 attacks.

Analysis:
1. The sentence is in the past tense, so the correct verb form to use is "has acknowledged" or "acknowledged."
2. The use of "could have been" is appropriate to indicate a possibility in the past.

Correct Answer Justification:
The correct answer is option C: "has acknowledged / could have been." This is the most suitable choice as it correctly aligns the verb tenses and modal verbs in the sentence.

In this sentence, the national security adviser acknowledges the need for better intelligence sharing in the past, indicating a past action. The modal verb "could have been" is used to suggest a possibility of improved intelligence sharing before the September 11 attacks, which is also in the past. Therefore, option C is the correct choice for this sentence.
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One of the US national security advisers ____ there ____ better intelligence sharing before the September 11 attacks.a)had acknowledged / can beb)acknowledges / might bec)has acknowledged / could have beend)acknowledged / must bee)would acknowledge / will have beenCorrect answer is option 'C'. Can you explain this answer?
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