We ____ hard together to achieve our common goal these years-to build a cleaner, safer and healthier world.
[     ]
A. have been working
B. are working
C. work
D. have worked
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科目：高中英語 來源：東北三省2011屆爾雅高考特快信息考試英語試題 題型：016

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—Have you found the missing?couple in the mountain ?

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