People around the country were excited __________ the astronauts came back to the earth safely.
A．unlessB．butC．untilD．because
D

試題分析：考查連詞。A. unless除非； B. but但是；C. until直到；D. because因為。句意：全國各地的人們都很激動，因為宇航員安全地返回地球。故D正確。
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