Answer: b)
Explanation: The phrase "such a" is used to express extreme or extraordinary characteristics or qualities of something. In this case, it is used to emphasize that the film was extremely boring.
Here's an example to illustrate the use of "such a":
- "The movie was such a disappointment that we left in the middle of it."
In this sentence, "such a disappointment" emphasizes the extreme level of disappointment experienced.
Therefore, the correct sentence would be: "It was such a boring film that we left in the middle of it."
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