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：河南省模擬題 題型：單選題

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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