Hello, everyone.
1) The government took an unprecedented decision to release all political prisoners at Easter.
2) The government took the unprecedented decision to release all political prisoners at Easter.
The intended meaning is that this is first mention.
Which sentence is grammatically correct? Does one sound better than the other?
The rationale behind #1: since this is first mention, then it is normal that we use the indefinite article.
The rationale behind #2: the following part of this sentence explains what decision is meant here, which means that this decision is quite specific, and perhaps might justify the usage of 'the'.
Reegis Which sentence is grammatically correct? Both are. at Easter').
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ReegisWhich sentence is grammatically correct?
Both are. Whether or not it is 'first mention', the decision is specified by the complement that follows it ('to release...at Easter').
Reegis Does one sound better than the other?
Frankly, no—not to me.