The Great Wall Space Agency's recent attempts to launch a man into space, a major goal of their space program for the past few years, has not substantially decreased the gaps existing between the technology rich and technology poor cities around the space center.
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Ahas not substantially decreased the gaps existing
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Bhas not been substantial in decreasing the gap that exists
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Chas not made a substantial decrease in the gap that exists
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Dhave not substantially decreased the gap that exists
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Ehave not been substantial in a decrease of the gap that exists
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正确答案: D