Question: Is this sentence correct, want to know particularly about the use of "able to" there? Yes. If you want something more forceful: In China, they have not been able to complete a single project in 3 years.
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AnonymousSentence: In China, they have not been able to complete one project in 3 years.Question: Is this sentence correct, want to know particularly about the use of "able to" there?Yes. If you want something more forceful: