One of the US national security advisers ---- there ---- better intell...
One of the US national security advisers has acknowledged there could have been better intelligence sharing before the September 11 attacks.
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One of the US national security advisers ---- there ---- better intell...
Explanation:
The correct answer is option C: "has acknowledged / could have been."
- The sentence is talking about something that happened in the past (before the September 11 attacks), so we need to use a past tense.
- The phrase "before the September 11 attacks" indicates that the action of acknowledging better intelligence sharing occurred before a specific point in the past.
- The option "has acknowledged" is in the present perfect tense, which is used to describe past actions that have a connection to the present. In this case, the action of acknowledging better intelligence sharing in the past is relevant to the current situation.
- The option "could have been" is the conditional perfect tense, which is used to express something that was possible in the past. In this case, it implies that there was a possibility of better intelligence sharing before the September 11 attacks, but it did not happen.
- Combining "has acknowledged" and "could have been" gives us the correct tense and conditional aspect to express the idea that the national security adviser acknowledged the need for better intelligence sharing in the past, which was a possibility but did not occur.
- The other options are incorrect because they use tenses that do not match the context of the sentence or do not convey the correct meaning.
In summary, option C is the correct answer because it uses the appropriate tenses and expresses the idea that the national security adviser has acknowledged the possibility of better intelligence sharing before the September 11 attacks.
One of the US national security advisers ---- there ---- better intell...
B