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WASHINGTON, Feb 22 (Reuters) - China, in an early test of U.S. President Donald Trump, has nearly finished building almost two dozen structures on artificial islands in the South China Sea that appear designed to house long-range surface-to-air missiles, two U.S. officials told Reuters.

The development is likely to raise questions about whether and how the United States will respond, given its vows to take a tough line on China in the South China Sea.

See more on the artificial islands in the South China Sea: