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Passage: Interest in space science has grown among Pakistani students following recent national satellite launches and international collaborations. Universities have introduced new aerospace engineering programs to meet rising demand, though experts caution that sustained investment in research infrastructure, not just enthusiasm, will determine whether the country can build a competitive space sector over time. Question: In the passage, the word ‘sustained’ most nearly means:
A. Cancelled or withdrawn
B. Reduced gradually
C. One-time and brief
D. Continued over a long period without stopping ✅
